If NOR is coded as 2-3-6, then how should REST be coded in the same code language?

Difference between alphabetical positions of N and O = 1 = difference between 2 and 3
Difference between alphabetical positions of O and R = 3 = Diff. between 3 and 6.
Similarly, for REST,
difference between R and E = 13,
difference between E and S = 14
and difference between S and T = 1
Try All option one by one and we will found that here, Only option (c) follows above condition.