Which of the following italicized phrases indicates CAUSE？A．He made us laugh with his joke

Which of the following italicized phrases indicates CAUSE？

A．He made us laugh with his jokes.

B．They dragged him down from his high position.

C．He acted so out of gratitude.

D．They roped her on to us for the sake of safety.

请帮忙给出正确答案和分析，谢谢！