If first half of the following series is written in the reverse order, then…

There are 26 letters in the English alphabet.

First half (13 letters): A to M

Second half: N to Z

Reverse the first half and write the full modified series:

M L K J I H G F E D C B A N O P Q R S T U V W X Y Z

Find the 10th letter from the right in this modified series. 10th letter from the right:

Counting from the right: Z = 1, Y = 2, X = 3, W = 4, V = 5, U = 6, T = 7, S = 8, R = 9, Q = 10. So the 10th letter from the right is Q.

Now find the 7th letter to the left of Q in the modified series. 7th letter to the left of Q:

Move left from Q: P (1), O (2), N (3), A (4), B (5), C (6), D (7). Therefore the 7th letter to the left of Q is D.

Answer: D