As Russian scientist Boris Alexei has observed, “The Earth is not a very good timekeeper.” Earth’sslightly irregular rotation rate means that measurements of time must be periodically adjusted.Specifically, an extra “leap second” (the 86,401st second of the day) is____time-based on the planet’s rotation lags a full nine-tenths of a second behind time kept by precise atomic clocks.

Which choice completes the text so that it conforms to the conventions of Standard English?

A short passage explicit the information to analyze, and interpret the main idea.

Special attention to the facts and details draws out the main idea.

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

Choice A is correct because it provides a clear and correct completion of the sentence that adheres to the conventions of Standard English. The phrase "added whenever" is a grammatically correct construction.

added whenever

Choice B is incorrect because it is simple past tense, implying a single action in the past.

added,whenever

Choice C is incorrect because the period (.) between "added" and "whenever" is incorrect in Standard English. When forming a compound word like "added whenever," it should not be separated by a period.

added.whenever

Choice D is incorrect because due to several grammatical issues and lack of clarity in the context.

whenever,added

Correct sentence

The most logical text for the given passage - Added whenever.

Option

A

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