A changes to ___ with hydroboration -oxidation
`A:CH_3CH=overset(CH_3)overset|C CH_3`
A. `CH_3undersetunderset(OH)|CH undersetunderset(CH_3)|CHCH_3`
B. `CH_3CH_2undersetunderset(CH_3)|oversetoverset(CH_3)|C CH_3`
C. `CH_3CH_2undersetunderset(CH_3)|CHCH_2OH`
D. none of these
