Correct option is B
Given series: 'Q B Z H X H Q D U M B’
When we arranged opposite to the one in which these normally appear in English Alphabet (i.e., in reverse order)
We get → Z X U Q Q M H H D B B
(Left) Z X U Q Q M
H H D B B
(Right)
Clearly, we can see
H is the fifth letter form right to left.
Hence, the correct answer is
"H".