As per the CAB code, A is coded as 5 and should be the same in case of A in DAD.
For C in the CAB, C is the third letter in the English Alphabet.
So, 1) $$3^2=9$$
2) $$9^3=\ 729$$
3) 729-6= 723.
These 3 steps are followed to find the code of C.
If we cross check with B, the second alphabet,
1) $$2^2=4$$
2) $$4^3=\ 64$$
3) 64-6= 58- Which is how B is coded.
So, for D- the fourth alphabet, we have
1) $$4^2=16$$
2) $$16^3=\ 4096$$
3) 4096-6= 4090.
So, Option B is the correct one.
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