I believe b is the correct answer
It just depends on how long you drive it.
I'm pretty sure it's "the baby cried" because an independent clause can stand alone and that can stand alone.
I don't remember anything about an "extended metaphor," but the poem's main focus is to remind herself that while she loves the earthly comforts of her house and all her material things... it is important to not over-love them and instead think of all the spiritual rewards that are awaiting her in heaven.
