-Who were those people with the banners?-A group itself the League For Peace.　A. calling

问题补充：

-Who were those people with the banners?

-A group itself the League For Peace.

A. calling

B. calls

C. called

D. is called

答案：

(答案→)A. calling

B. calls

C. called

D. is called

解析：主语是a group, 因此把自己叫做和平组织的动作是主动的，用现在分词。