In which of the following sets of values are all values in different equivalence partitions?

A system is designed to accept values of examination marks as follows:

Fail: 0C39 inclusive

Pass: 40C59 inclusive

Merit: 60C79 inclusive

Distinction: 80C100 inclusive

In which of the following sets of values are all values in different equivalence partitions?
A . 25, 40, 60, 75
B . 0, 45, 79, 87
C . 35, 40, 59, 69
D . 25, 39, 60, 81