Correct Answer: XYzB

Solution : Given:

LMnP, PQrT, TUvX, ?

Note: The following part first letter is the last letter of the preceding part.

First term: LMnP
LMn represents a sequence of the alphabet. Then, N + 2 = P
Third letter is the small letter of the alphabets → N → n

Second term: PQrT
First letter → P → Last letter of the first part
PQr represents a sequence of the alphabet. Then, R + 2 = T
Third letter is the small letter of the alphabets → R → r

Third term: TUvX
First letter → T → Last letter of the second part
TUv represents a sequence of the alphabet. Then, V + 2 = X
Third letter is the small letter of the alphabets → V → v

Fourth term: XYzB
First letter → X → Last letter of the third part
XYz represents a sequence of the alphabet. Then, Z + 2 = B
Third letter is the small letter of the alphabets → Z → z

Therefore, the series becomes:
LMnP, PQrT, TUvX, XYzB

Hence, third option is correct.