Male and female students are quite different from each other

Male and female students are quite different from each other______ the age at which they begin to develop an intellectual self-discipline.
A.with regard to B.in the light of C.in honor to D.on account of
B,WHY?

选A.“在开始形成理智的自律能力的年龄这一方面,男女生的情况有很大差异.”
with regard to——就……方面,在……问题上,可替换为regarding.
in the light of——鉴于,由于.in honour of——为了纪念（某人）,为了向（某人）表示敬意.on account of由于,因为.