In which of the following case of mixing of a strong acid with strong base (each of 1N concentration), temperature increase will be the highest ?

A. 30 c.c acid and 30 c.c base
B. 20 c.c acid and 25 c.c base
C. 15 c.c acid and 35 c.c base
D. 35 c.c acid and 15 c.c base