C2E, E5H, G 12K, I27N, ?

The first letter of each term is the second letter from the first letter of its preceeding term.
C D E F G H I.
The missing term should start with K.
The last letter of each term is the third letter from the last letter of its preceeding term.
Hence the last term of the missing term is Q.
The numbers in each term is (n-1) more than twice the number in the previous term where n is position of the term.
1st term n=1
2nd term n=2 and so on.
The fifth term must be 4 more than twice of 27.
Hence the number in the fifth term is 58.
The missing term is K58Q.
Option C is the correct answer.