Select the most appropriate subject pronoun for the following situation: When you are speaking about your sister and yourself.

The correct answer is YOU

Explanation:

In the following sentence the subject pronoun is YOU.

When you are speaking about your sister and yourself.

A subject talks about who performs the action, in this case the action is are speaking and this actions is performed by the subject pronoun YOU.

your sister is an exampleof an object, it means who receives the actions and yourself is a reflexive pronoun