The mood of that line definitely is frustrated.
Hope this helps. :)
The answer to your question is,
Why write about a house?
-Mabel <3
I don't know any of the other similes because I have no idea what poem you read but here is the answer to what growing old like an onion could convey:
Onions are layered, as they grow more and more layers grow. This could mean that as Rachel grows, she gains more layers of knowledge and experiences and they keep layering over time as she grows.
Part I answers: T,T,F,T
Part II answers: You dont have to give a written answer (Im pretty sure)
Part III answers: This is a personal question, if you don't have an answer pick a random number out of the 5
Part IV answers: I don't think this requires a written answer
On part II and IV maybe just don't do it if your not comfortable with it, you wont have to give a written answer. I hope this helps :) :)
Uhhhhh why r u asking this here mf