In the South Pacific, New Caledonian crows use two different kinds of stick tools. One tool is complex. The crows shape a stick from a rare plant into a hook. The other tool is basic. The crows find a stick without a hook on the ground. The hooked tool is harder to get but is much better than the basic tool at removing prey from holes. When studying New Caledonian crows, ecologist Barbara Klump found that they hold the hooked tools in their claws when not using them, or they carefully put them in a safe place. The crows don’t do the same with the basic tools. This suggests to Klump that the____

Which choice most logically completes the text?

The details and facts help to draw the main idea of the passage.

Can you summarize what you’ve understood in the above steps?

Choice A is the best answer because it most logically completes the text’s discussion of the two types of stick tools used byNew Caledonian crows. The text indicates that the more effective type of tool has a hook that the crows make themselves,while the other type of tool is simply a stick without a hook that the crows fi nd and don’t shape in any way. According to thetext, Klump found that the crows keep hooked tools—but not the tools without hooks—in their grasp or in safe places whenthey aren’t using the tools. If the hooked tools are more effective than the tools without hooks are and the crows are moreprotective of the hooked tools than they are of the tools without hooks, it’s reasonable to conclude that the hooked tools aremore valuable to the crows than the tools without hooks are.

hooked stick tools are more valuable to the crows than the stick tools without hooks.

Choice B is incorrect because the text gives no indication of how easy it is for the crows to hold either the hooked tools orthe tools without hooks. The text does state that crows hold the hooked tools and not the tools without hooks when thetools aren’t in use. However, the text also indicates that the hooked tools require work from the crows to make and are moreuseful for helping the crows catch prey than the tools without hooks are. This context suggests that the crows hold thehooked tools because they’re more valuable to the crows than the tools without hooks are, not because the hooked tools areeasier to hold.

hooked stick tools are easier for most of the crows to hold than the stick tools without hooks.

Choice C is incorrect because the text makes no mention of the crows sharing tools. Additionally, the textindicates that when the crows aren’t using the hooked tools, they either grasp the tools or store them safely, which suggeststhat the crows try to maintain possession of the hooked tools, not that crows prefer to share those tools

crows prefer to share their hooked stick tools but don’t share the stick tools without hooks.

Choice D isincorrect because the text says nothing about the crows using their claws to remove prey from holes, so there’s no evidencethat the crows perceive the stick tools to be less effective than their claws are.

crows realize that both kinds of stick tools are less effective than their claws are at removing prey from holes.

Correct sentence

The choice that logically completes the text - collected

Choice

A

Can you summarize what you’ve understood in the above steps?