In the following carbocation which group is most likely to migrate to the positively charged carbon
`overset(P)D-underset(CH_(3)-H_(2)C)underset(|)overset(OH)overset(|)(C)-overset(oplus)(C)H-underset(underset(s)(C)H=CH_(2))underset(|)overset(overset(r)(H))overset(|)(C)-Ph rarr`
A. p
B. q
C. r
D. s