Which phrase provides the best clue to the meaning of the word thwart

To hinder, impede or frustrate someone from achieving a set goal.

Explanation:

Thwart could either be a noun or a verb, the context determines its part of speech when used in a sentence. As a verb, it depicts that a desire could not be realized because it was frustrated by someone or something.

For example:

i. She did all she could to thwart his plans.

This simply means that she after all successfully impeded him from accomplishing his plans.

ii. Paul's aim to achieve a B in his English test was thwarted by his friend.

This makes us to understand that Paul's friend affected his plans to make a B grade in the test.

to persuade readers which is answer c