M: Kate, look! The passengers are coming from the plane, and there’s Susan.
W: Which one
M: The tall one next to the window.
W: The one with the suitcase
M: No. The one with the package under her arm.
W: Oh, yes! That’s Susan!
M: Hello, Susan! How was the trip
W: Fine. It was a very good flight.

How many people are there in the dialogue()

A．2.
B．3.
C．4.