Select the correct option that will fill in the blank and complete the series.LM, QR, VW, ______

Let's observe the first letters of each cluster:$L(12)\to Q(17)$ : $+5$$Q(17)\to V(22)$ : $+5$$V(22)+5=27\equiv 1⟹A$ Now let's observe the second letters of each cluster:$M(13)\to R(18)$ : $+5$$R(18)\to W(23)$ : $+5$$W(23)+5=28\equiv 2⟹B$ The next cluster in the series is AB.