While Having a Discussion, Technician a Says That the Purpose

While having a discussion, Technician A says that the purpose of a differential is to transfer power from the driveline to the wheels. Technician B says that it increases engine torque by providing a final drive gear reduction, usually of about 2.5 to 3.5 to 1. Who is correct?

A) A only
B) B only
C) Both A and B
D) Neither A nor B