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TVX
TUX
TWY
TVW
TVX
Identify the positional difference between the start of the first term and the start of the second term (A to F is +5); apply the same constant increment to all letters.
Identify the positional difference between the start of the first term and the start of the second term (A to F is +5); apply the same constant increment to all letters.
Analyze the pattern of the first pair
A(1) + 5 = F(6), C(3) + 5 = H(8), E(5) + 5 = J(10). The pattern is +5 for every letter.
Apply the pattern to the second pair
O(15) + 5 = T(20), Q(17) + 5 = V(22), S(19) + 5 = X(24). The resulting sequence is TVX.
B: TUX is wrong because U is position 21 (Q+4), C: TWY is wrong because W and Y do not follow the +5 increment, D: TVW is wrong because W is position 23 (S+4).
A is correct because the pattern established in the first triplet is adding 5 to the position of each letter, which when applied to OQS, results in TVX.
For letter analogies, always convert letters to their numerical positions (A=1, Z=26) immediately; it makes spotting the difference (+N or -N) much faster than visual counting.