Select the option that represents the letters that, when placed from left to right in the blanks below, will complete the letter series.

S _ Y A _ F I K M _ S U W​​

Given: S _ Y A _ F I K M _ S U W

From the given options 

S V Y A C F I K M P S U W (Sequence followed because - the difference is 3, 3, 2, 2 alternatively.)

S V Y A B F I K M P S U W (Sequence not followed.)

S V Y A C F I K M Q S U W (Sequence not followed.)

S U Y A C F I K M P S U W (Sequence not followed.)​​

Correct answer is (a) VCP.