When Balram (B) covers 1600 m, Akshay (A) covers (1600 - 128) m.
So, when B covers (1600/16) = 100 m, A covers (128/16) m = 8 m less i.e. 92 m.
When B covers 100 m, C covers (100 - 4) = 96 m.
Thus the ratio in which A and C cover distances is 92: 96.
In 96 m, C gains (96 - 92) = 4 m over A.
So in 1.5 miles (i.e. 2400 m), c gains 100 m = (1/16) miles over A.
Option D is Correct Answer.