In general, American literature can be thought of as somewhat of a "mirror" when it comes to the American identity and culture. It shines a light on the American identity.
Answer:
d) The casualties in Vietnam
Explanation:
Kinnell doesn't set out to write a politically charged poem, but the connections he makes lead him in that direction, nonetheless. While living in a Vietnamese hamlet, the narrator of the poem Vapor Trail Reflected in the Frog Pond hears "America Singing," a song composed of the crunching of weapons and the buzz of a bomber jet. Thus, it contrasts conflict with tranquility by depicting a bomber against a tranquil background of the loss.
I would say tense and uncomfortable because "it was undoubtedly hot" "he began to sweat" "began to throb in his ears" the sweat and heat makes it very uncomfortable also, the rumbling and throbbing sound makes it tense.
hope this helps :D