催化剂可以增大化学反应速率，主要是因为反应的（）。

A、<IMG src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/staticQuestionImg/959f01b6-4796-4dcd-bc0d-ffce91c45f32.jpg"title="1373963765609.jpg" alt="1373963765609.jpg"/>&nbsp;

B、<IMG src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/staticQuestionImg/92242b35-e6c7-49fa-8555-2cddc1a96644.jpg"title="1373963783062.jpg" alt="1373963783062.jpg"/>

C、<IMG src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/staticQuestionImg/0d78ec3f-4766-4adf-b5ee-1063f4c4f14b.jpg"title="1373963796453.jpg" alt="1373963796453.jpg"/>

D、<IMG src="https://s3.cn-north-1.amazonaws.com.cn/qingshuxuetang/staticQuestionImg/f8d899b5-88f9-465f-979d-5cf8467547cb.jpg"title="1373963806562.jpg" alt="1373963806562.jpg"/>