Which of the following best explains why the chinese rebuilt the great wall in the 1400s? a. to keep out invaders from the japanese islands b. to keep out mongolian invaders from the north c. to keep peasants employed and content d. to keep merchants and traders from exporting chinese goods

B.
Is the answer i learned while studying 

1) which is an example of active listening during a formal discussion the answer is d. responding to questions this proves that you were actively listening to the conversation being held in the discussion and that you also know about the topic being discussed2) finding the right balance in a formal discussion is primarily the answer is a. being activeyou want to actively take part of the discussion and prove that you are focused. able to understand what others are saying and make your own input