Problem

After hours of searching for her lost keys, she realized her efforts were in____."

Fill in the blank with the correct meaning of producing no result; useless.

Clue

Thinking she was better than she actually was for searching so long.

Sumup

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Choice-A

Choice A is incorrect because this would imply that the search for the keys resulted in finding them, which is not the case here as the search ended without success.

{sbBox2-wrong} Successful

Choice-B

Choice B is incorrect because this term suggests that the search led to a useful outcome or result. Again, this doesn’t fit the context since the search was ultimately unsuccessful.

{sbBox2-wrong} Productive

Choice-C

Choice C is correct because this means that the efforts were ineffective and did not achieve the desired result, which matches the context of realizing the efforts were unsuccessful.

{sbBox2-correct} In vain

Choice-D

Choice D is incorrect because this term would indicate that the efforts provided a satisfying or beneficial result, which contradicts the notion of realizing that the efforts were futile.

{sbBox2-wrong} Rewarding

Sumup

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Answer

Choice C

Sumup

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