Concept:The series increases by consecutive natural numbers: +2, +3, +4, then +5.Explanation:M is the 13th letter. O is 15th (13+2). R is 18th (15+3). V is 22nd (18+4).The next increase is +5. 22+5 = 27. Since the alphabet has 26 letters, 27 corresponds to the 1st letter, which is A.
