An Object's Angular Momentum Changes by 10 Kg-M²/s in 2

Multiple Choice

An object's angular momentum changes by 10 kg-m²/s in 2.0 s. What magnitude average torque acted on this object?

A) 10 N-m
B) 5 N-m
C) 2.5 N-m
D) 40 N-m
E) 20 N-m