The Freeman family is barbecuing veggie burgers, corn cobs, and mushroom caps in their local park. If 3/8 of the items barbecued are veggie burgers, and 1/3 of the items barbecued are corn cobs, what fraction of barbecued items are mushroom caps?
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A : 17/24
B : 4/11
C : 3/8
D : 1/8
E: 7/24