11. From the set $\{1,2,3,4,5,6,7,8,9\}$, select three different numbers, requiring that these three numbers must include 5 and their sum must be 15. The number of such selection methods is ( ).
(A) 3 .
( B) 4 .
(C) 5 .
(D) 6 .
( E) 7
B

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