Correct Answer - B
The first reaction is an syn addition of borane. In the illustration, we have shown that both `B` and `H` atoms enter from the bottom side of `1`-methtylcyclohexene. The reaction can also take place from the top side at an equal rate to produce the entaiomer.
Hydroboration
In the second reaction, the `B` atom is replaced by a hydroxyl group with the retention of configuartion. The product is a trans compound (trans `-2`-methylcyclohexanol), and the overall result is the syn addition of `H- and-OH`.
