Calculate the Change Internal Energy (ΔE)for a System That Is

Calculate the change internal energy (ΔE) for a system that is giving off 45.0 kJ of heat and is performing 855 J of work on the surroundings.

A) 44.1 kJ
B) -44.1 kJ
C) -45.9 kJ
D) 9.00 × 10² kJ
E) -9.00 × 10² kJ