A flashback tells something from the past so the answer would have to be (A) this is because of the use of the word recall. In every other option the verb is present or future tense instead of past tense.
I´d say A. Others don´t make much sense in the context.
Since the speaker compares himself to a night owl and Wilson to an early bird without the usage of the words "like" or "as", this is an example of metaphor. The reader is obviously not actually a night owl, but is merely saying that he's more active at night.
Denotation is like the actual meaning, almost like the dictionary definition.!
Connotation is words that are different names but mean the same things .
