`A/4,D/9,H/15,M/22`, ?

Options

A. `R/30`
B. `S/30`
C. `Q/31`
D. `Q/30`

Answer

B

Explanation

`underline(A)overset(+3)(to)underline(D)overset(+4)(to)underline(H)overset(+5)(to)underlineMoverset(+6)(to)underlineS`
`4underset(+5)(to)9underset(+6)(to)15underset(+7)(to)22underset(+8)(to)30`