Find the missing character?

A
G
M
P

The missing character is M.

The sequence is a list of letters that are two places apart in the alphabet, starting with A. The next letter in the sequence is M, which is two places after G.

A. A is the first letter of the alphabet, so it is not two places after G.
B. G is the seventh letter of the alphabet, so it is not two places after G.
C. M is the thirteenth letter of the alphabet, so it is two places after G.
D. P is the sixteenth letter of the alphabet, so it is not two places after G.