The minimum fine for driving in excess of the speed  limit is $25. An additional $6 is added to the minimum fine for each mile per hour (mph) in excess of the speed limit. Rachel was issued a $103 fine for speeding in a 55-mph speed limit zone. For driving at what speed, in mph, was Rachel fined?
A. 48
B. 52
C. 62
D. 68
E. 78