If C and D are unique integers, does C = 0?

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If C and D are unique integers, does C = 0?

by Vincen » Thu Feb 08, 2018 8:16 am
If C and D are unique integers, does C = 0?

(1) CD = C^2
(2) D = 4

The OA is the option A.

Experts, how can I determine if C=0 or not, using the statement (1)? May you clarify this DS question to me? Thanks.