Correct Answer: QXOT

Solution : Given:
MPKL, NRLN, OTMP, PVNR,?

In the above-given series, add 1 to the place value of the first and third letters, and 2 to the place value of the second and fourth letters to get the next term.
First letter of the series – M + 1 = N; N + 1 = O; O + 1 = P; P + 1 = Q
Second letter of the series – P + 2 = R; R + 2 = T; T + 2 = V; V + 2 = X
Third letter of the series – K + 1 = L; L + 1 = M; M + 1 = N; N + 1 = O
Fourth letter of the series – L + 2 = N; N + 2 = P; P + 2 = R; R + 2 = T

So, QXOT is the missing term of the series. Hence, the first option is correct.