Two identical rods are connected between two containers one of them is at 100°C and another is at 0°C. If rods are connected in parallel then the rate of melting of ice q1 gm/sec. If they are connected in series then rate is q2. Then the ratio q2 /q1 is
(A) 2
(B) 4
(C) 1/2
(D) 1/4