In a Certain Material There Is a Current of 12

Multiple Choice

In a certain material there is a current of 12 A flowing through a surface to the right,and there is an equal amount of positive and negative charge passing through the surface producing the current.How much negative charge passes through the surface?
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A) 6 C/s toward the right
B) 6 C/s toward the left
C) 12 C/s toward the right
D) 12 C/s toward the left
E) 24 C/s toward the left