Which statement best evaluates the effectiveness of the argument?

Which option is the most relevant piece of evidence for this claim

Which choice is a major detail from paragraph two? a) the great wall is a large network of several walls and towers. b) the great wall looks like a long wall snaking its way across china. c) the great wall was constructed over hundreds of years beginning in 221 b.c. d) the great wall construction encouraged several independent kingdoms to unite.

Which of the following is an element of plot