What Is the Change in Internal Energy $\Delta$ E) When a System Is Heated with 35 J of When

Multiple Choice

What is the change in internal energy ( $\Delta$ E) when a system is heated with 35 J of energy while it does 15 J of work?

A) +50 J
B) +20 J
C) -20 J
D) -50 J
E) +35 K