单项选择题

My income is now twice as much as I used to earn two years ago.

A.我现在的收入是两年前的两倍。
B.我现在的收入比两年前多两倍。
C.我现在的收入是我习惯收入的两倍。
D.我现在的收入比习惯收入多了两倍。