A Closed, Uninsulated System Was Fitted with a Movable Piston $\Delta$

A closed, uninsulated system was fitted with a movable piston. Introduction of 483 J of heat caused the system to expand, doing 320 J of work in the process against a constant pressure of 101 kPa (kilopascals) . What is the value of $\Delta$ E for this process?

A) (483 + 320) joules
B) (483 - 320) joules
C) (320 - 483) joules
D) 483 joules
E) (-320 - 483) joules