What rhetorical elements does Wilfred Owen use in the stanza below from "Anthem for Doomed Youth?"

both the address and the poster use diction to convey their message. diction is defined as a style of writing or speaking based on the types of words chosen in order to send a message. parallelism is when a similar sentence structure is used for several sentences on a text; roosevelt's address doesn't follow that. repetition has to do with repeating a word or sentence in order to emphasize and idea, however neither the poster nor the address use repetion. finally, the address doesn't use images to convey a message.

smiling at my mother, when i cleaned my room, to ask my parents for a favor

"to cut the cord" means to cease to rely upon someone or to become independent.   i think, perhaps, your question was multiple choice.   if not, i'm not entirely sure what you mean by select two options. hope this at least a little!