Determine which of the following reactions at constant pressure represents surroundings that do work on the system:
I. `4NH_(3)(g)+7O_(2)(g)rarr4NO_(2)(g)+6H_(2)O(g)`
II. `CO(g)+2H_(2)(g)rarrCH_(3)OH(l)`
III. `C(s,"graphite")+H_(2)O(g)rarrCO(g)+H_(2)(g)`
IV. `H_(2)OrarrH_(2)O(l)`
A. II,IV
B. II and III
C. II,IV
D. I and II,IV
