He is ______ M.A.
He is ______ M.A.
A: at
B: an
C: of
D: None of these
Use the article an before an initial that begins with a vowel sound. The letter M begins with an em sound which is a vowel sound. Therefore an M.A. is correct. At M.A. or of M.A. do not suit the structure. Article choice with initials depends on pronunciation not spelling.