Read the following SAT test question and then click on a button to select your answer.

-(a-1)(b-1)(c-1)
Which of the following is equivalent to the expression above?

A.(1-a)(b-1)(1-c)
B.-(1-c)(1-b)(1-a)
C.(c-1)(1-b)(a-1)
D.-(a-1)(1-b)(c-1)

来源:可可英语 http://www.kekenet.com/sat/201711/530862.shtml