How did young Americans respond to John F. Kennedy's challenge?
A. They protested in favor of consumerism.

B. They became active in politics.

C. They joined the army in large numbers.

D. They became nuclear scientists.

answer; (external conflict)

third person

explanation:

note the usage of names and pronouns, "james" & "the old man". this alone can confirm it as third person, as first person uses "i" and the like, while second person uses "you" and the like.

~

the rigid outer part of the earth, consisting of the crust and upper mantle is the lithosphere.     answer   crust and outer part of the mantle.