The Qing Tombs are obviously influenced by the Ming Tombs, especially _________architecture and their choice of site among the mountains and valleys.

A．in terms of

B．in case of

C．as a result of

D．in the face of

甲与乙签订一价款为80000元的合同，约定定金20000元。实际交付定金时乙只向甲支付了10000元，甲未提出异议。根据合同法的规定，该定金合同的效力是( )。

A．定金合同有效，定金数额为20 000元

B．定金合同有效，定金数额为16 000元

C．定金合同有效，定金数额为10 000元

D．定金合同无效