Which of the following terms will replace the question mark (?) in the given series?WGZC, TJVG, ?, NPNO, KSJS

Let's analyze the pattern for each position of the letter-clusters in the series:1st letter: W $\to$ T $\to$ ? $\to$ N $\to$ K$\text{W}(23)-3=\text{T}(20)$$\text{T}(20)-3=\mathbf{Q}(17)$$\text{Q}(17)-3=\text{N}(14)$$\text{N}(14)-3=\text{K}(11)$ 2nd letter: G $\to$ J $\to$ ? $\to$ P $\to$ S$\text{G}(7)+3=\text{J}(10)$$\text{J}(10)+3=\mathbf{M}(13)$$\text{M}(13)+3=\text{P}(16)$$\text{P}(16)+3=\text{S}(19)$ 3rd letter: Z $\to$ V $\to$ ? $\to$ N $\to$ J$\text{Z}(26)-4=\text{V}(22)$$\text{V}(22)-4=\mathbf{R}(18)$$\text{R}(18)-4=\text{N}(14)$$\text{N}(14)-4=\text{J}(10)$ 4th letter: C $\to$ G $\to$ ? $\to$ O $\to$ S$\text{C}(3)+4=\text{G}(7)$$\text{G}(7)+4=\mathbf{K}(11)$$\text{K}(11)+4=\text{O}(15)$$\text{O}(15)+4=\text{S}(19)$ Combining the missing letters gives QMRK.