The correct option is
A N P S W C
In all the terms except in (4) the number of letter missing between the letter in consecutive positions is in the increasing order. One letter is skipped between the letters at positions 1 and 2.
Two-letter are skipped between letter at positions 2 and 3.
Three letters are skipped between letter at positions 3and 4.
Four letters are skipped between letter at positions 4 and 5.
However in term (4) five letter are skipped between letter at positions 4 and 5.