Excuse me, but may I ask you _____? [ ]

A. what business are you in

B. what business you're in

C. in what business are you

D. are you in what business

商业利润是商业企业从事经营活动所取得的（），是企业一定时期的全部收入扣除（）、（）和（）等支出后的余额。