An Ideal Gas (The System) Is Contained in a Flexible $\Delta$

An ideal gas (the system) is contained in a flexible balloon at a pressure of 1 atm and is initially at a temperature of 20.°C. The surrounding air is at the same pressure, but its temperature is 25°C. When the system has equilibrated with its surroundings, both systems and surroundings are at 25°C and 1 atm. In changing from the initial to the final state, which one of the following relationships regarding the system is correct?

A) . $\Delta$ E < 0
B) . $\Delta$ E = 0
C) . $\Delta$ H = 0
D) w > 0
E) q > 0