Which of the following represents isobaric process?
A. W = P∆V where P is pressure, ∆V is change in volume and W is work done.
B. W = 0 where W is work done.
C. Q = W where Q is heat and W is work done.
D. Q = 0 where Q is heat.
E. ∆U = 0 where ∆U is change in internal energy