Step-by-step Solution:

\[ \text{Series: } KJR,\; MMP,\; OPN,\; QSL,\; ? \] \[ \text{1st letters: } K(11),\; M(13),\; O(15),\; Q(17) \Rightarrow +2 \Rightarrow S(19) \] \[ \text{2nd letters: } J(10),\; M(13),\; P(16),\; S(19) \Rightarrow +3 \Rightarrow V(22) \] \[ \text{3rd letters: } R(18),\; P(16),\; N(14),\; L(12) \Rightarrow -2 \Rightarrow J(10) \] \[ \text{Missing term} = \boxed{\text{SVJ}} \] \[ \text{Correct option: C} \]