Answer:
Haven't read it but planning to. I say go for it!
Trip is the noun. Trip is a noun. By definition it is a noun.
The answer is movement...
Iambic pentameter is fives sets of iambs, or one unstressed followed by one stressed.
The only choice that matches that description is option A.
The others all start with a stressed syllable, so they can not be iambs.
Hope this helps =)