# 1-Methyl cyclopentene can be

converted to given compound by the use of following reagents

$\begin{array}{1 1}a)\;BD_3\; followed\; by\; CH_3COOH\\b)\; BH_3 \; followed\; by\; CH_3COOD\\c) \;BD_3\; Followed\; by \;CH_3COOD\\d)\; BH_3\; followed\; by \;CD3COOH\end{array}$

Hence (b) is the correct answer.
edited Dec 6, 2013