former

I chose A

I think the distinction here is the fact that it says in the question: "Rock’s wife has an account at Best Trade Co" indicating that she is a client, fee paying or not.

A beneficial owner only needs to wait if they are trading in a personal account - meaning not as a client of the particular research. only then would Rock need to wait.

Since the wife is a client, again fee paying or not, she is allowed to be privy to the research and therefore can trade immediately.

Continuation of BPdulog's std 6B quote:
...Family accounts that are client accounts should be traeted like any other firm account and should neither be given special treatment nor be disadvantaged because of family relationships.