The passage of the poem is not presented. Please provide one.
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 =)
So that is much easier for other people to understand the answer and easier to answer.
Are there choices that I can choose from?