The following question is based on the following alphabet series.
A  B  C  D  E  F  G  H  I  J  K  L  M
N  O  P  Q  R  S  T  U  V  W  X  Y  Z Which alphabet comes immediately before the sixth alphabet from the left extreme of the given alphabets ?

Answer: A. E

The sixth letter from the left is F. E comes immediately before F.