In which case mentioned in the passage would an automatic language translator be helpful（）

A. nevertheless
B. though   
C. however    
D. for example

A. Set up a e-store and do business online.
B. Keep silent if you are not satisfied with what you’ve bought from your friends.
C. Return your purchases if you are not pleased with the goods from your friends.
D. Be careful when e-shopping and avoid making money from your friends on line.