一定温度下，已知反应的ΔrG mθ和某时刻的活度商Qa，则ΔrG m=？

A、<IMG src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/staticQuestionImg/6de2715f-7712-4527-bb94-c566e6094db7.jpg"title="1377586095031.jpg" alt="1377586095031.jpg"/>&nbsp;

B、<IMG src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/staticQuestionImg/3babe3a3-f838-4f0b-8ddc-4afafc054b8e.jpg"title="1377586220671.jpg" alt="1377586220671.jpg"/>

C、<IMG src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/staticQuestionImg/032f0d12-0bf0-4479-9cd9-de49e18e629a.jpg"title="1377586234406.jpg" alt="1377586234406.jpg"/>

D、<IMG src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/staticQuestionImg/0564f331-31cd-4033-b7fd-b3763dfd4269.jpg"title="1377586249937.jpg" alt="1377586249937.jpg"/>