One of the terms in list S is 8, and no term is greater than 8. If S has four terms and its median is 4, then what is the greatest possible value of its average (arithmetic mean)?
A. 4
B. 4.6
C. 5
D. 6
E. 8
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A. 4
B. 4.6
C. 5
D. 6
E. 8