?Fill in the blank to make the following number divisible by 18, and explain why:
6488__
A. ?1, because the sum of the digits must be divisible by 9.
B. ?4, because the number must end in an even number.
C. ?4, because the number must end in an even number and the sum of the digits must be divisible by 9.
D. ?there is no number that will work.
E. ?any even number that will make the sum of the digits equal to a multiple of 3.
Answer: D
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