If abc = 1 , cde = 0 , and xyu = 0, which of the following must be zero? Choose the correct choice from the following choices
A) E	B) D	C) C	D) B	E) A
abc = 1 which means neither a / b/ c is 0   c x de = 0 , we know c is not 0 from above hence either d or e must be 0.   d x a x c = 0, we know from first expression that a and c are not 0 hence d =0.   OPTION D
<result>B</result>
If abc = 1 , cde = 0 , and xyu = 0, which of the following must be zero?