_ nmmn _ mmnn _ mnnm _

Question: _ nmmn _ mmnn _ mnnm _
[A].

nmmn

[B].

mnnm

[C].

nnmm

[D].

nmnm

Answer: Option C

Explanation:

The series is nnmm/nnmn/nnmm/nnmm. Thus, the pattern ‘nnmm’ is repeated.