The tornado precluded our trip to the zoo .
a. happened after
b. enlivened
c. endangered
d. made impossible

d. made impossible

Explanation:

The meaning of preclude is to prevent or stop something from happening. That is, to make something impossible.

Preclude also means to prevent someone from doing something or make it impossible for someone to do something.

Therefore, the correction option is "d. made impossible".

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.