Why is contrasting between two things an effective technique

Contrasting two things is an effective technique to use because to make a point it is important to compare what you mean with something similar. Usually it is most important when wanting to express a thought or word you cannot remember by using a similar one to contrast it from the other

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the autor of the text is bringing the point that one achievment of the president john f. kennedy was a success and this caused the next president to use a similar idea. the purposefor the use of the quotation in the text is to support the idea that peace corps was a result of the president's call. in this case, the quotation is presented as part of the writing and does not stand on its own.

answer a.