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【单选题】
在西的遗传中，已知黄皮基因(Y)对绿皮基因(y)显性，但在另一白色显性基因(W)存在时，则基因Y和y都不能表达。现有基因型WwYy的个体自交，其后代表现型种类及比例 [     ]
A.
2种，13：3
B.
3种，12：3：1
C.
3种，10：3：3
D.
4种，9：3：3：1
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