Correct Answer: RVV

Solution : Let's check each option –
First option: RVV; R + 4 = V, V is the opposite letter of E, not V.
Second option: ADW; A + 3 = D, D is the opposite letter of W.
Third option: EHS; E + 3 = H, H is the opposite letter of S.
Fourth option: JMN; J + 3 = M, M is the opposite letter of N.

So, the first option is different from the other three options because the difference between the place values of the first and second letters is 4 instead of 3 and the third letter is not the opposite letter of the second letter. Hence, the first option is correct.