With no explanation, chose the best option from "A" or "B". Tom is walking down the street when he sees a guy he knows waving at him from across the street. Tom wants to react to the guy waving at him.

A: Tom just looks at the guy for a few seconds then looks away and keeps walking down the street.
B: Tom waves back at the guy waving at him in a friendly way before going on his way.
B.