Select the option that is related to the third term in the same way as the second term is related to the first term. H18J, J22L :: P34R : ?

In H18J: H is the 8th letter, J is the 10th, and the number 18 = 8+10. Similarly J22L: J=10, L=12, 10+12=22. For P34R: P=16, R=18, 16+18=34 and the next pair follows the same +2 letter jump, giving R38T (R=18, T=20, 18+20=38).