I'd say it's D) Indirect object, but I'm not sure, so don't take my word as gospel :)
Well saying dunno is an error in formal/academic writing. In academic writing you would have to write, i do not know, though.
Answer: Allusion
Explanation:
An allusion is an expression which is used to call someone or something to mind Eben though that particular thing is not mentioned explicitly. It is an indirect reference.
Most allusions in literature assumes that the reader has already has some knowledge regarding what's discussed and therefore should be able to understand the indirect reference.
I describe her as a good singer; talented, because she is a mother. A person in her own self; reading, writing, etc.
I would be more than willing to help with a favorite memory. These are some of the most creative writing projects Ive ever done.