If ab - 2c = a(b - c), which of the following must be true?	Select.
A) a=2 and c=0	B) a=1/2 and b=2	C) b=1 and c=0	D) a=1 or b=0	E) a=1/2 or c=0
ab-2c = a (b-c)   ab - 2c = ab - ac   2c= ac   ac-2c = 0   c(a-2) = 0   Either c = 0; or a = 2   a=2 and c=0 is the answer
<result>A</result>
If ab - 2c = a(b - c), which of the following must be true?