问题：
[单选题]
王某投资设立甲个人独资企业（下称甲企业），委托宋某管理企业事务。授权委托书中明确宋某可以决定20万元以下的交易。宋某未经王某同意，以甲企业的名义向乙企业购买30万元原材料，乙企业不知甲企业对宋某权利的限制。下列关于合同效力及甲企业权利义务的表述中，符合个人独资企业法律制度规定的是（）。
A、
合同无效，甲企业有权拒绝支付30万元货款
B、
合同部分无效，甲企业向乙企业出示授权委托书后，有义务支付20万元货款
C、
合同有效，甲企业有义务支付30万元货款
D、
合同效力待定，甲企业追认后方有义务支付30万元货款
参考答案：
C
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