What Is a Likely Benefit of Having Trained a Client

What is a likely benefit of having trained a client to say both "truck" and "vehicle" in response to your saying "fire engine"? The client will now likely:

A) point to pictures of trucks or vehicles.
B) say "fire engine" when you present a picture of it.
C) say "truck" when you say "vehicle."
D) point to a truck when you say "vehicle."