Metaphor, adults are being compared to children without the use of like or as.
The correct answer is A.
A direct address is the name of the person who is being directly spoken to (note that it is not just any name - as you can see in this example, Sarah is not a direct address because she is being mentioned, not spoken to). A direct address is also often set off by commas. In this example, Sam is being told to come inside, so we know that this is the direct address.
Your answer is B. He is bold.