In an inconvenient truth the most likely reason the author uses the heading a silent alarm is to

a-grab the readers interest
b-frighten the readers so the will take action
c-use an image that all readers can visualize
d-show that there is a problem that many do not know about

In an inconvenient truth, the most likely reason the author uses the heading a silent alarm is to show that there is a problem that many do not know about

Explanation:

The term silent alarm shows that the topic is something that is not at plain sight for everyone, in this documentary Al Gore travel around giving conferences about the threat that we are facing with the global warming and how we are blindfolded because we are taking nature for granted and we are really used to live in the technology and practical world.

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.