Initially I thought it was A&B but the option is not there. Please guide me through this. Thank you.

A Moving to another question will save this response. Question 11 The price in a competitive market, without any inefficiencies, maximizes the gains from trade, because A. No other single price can provide as much surplus to producers O B. No other single price can provide as much surplus to consumers C. No other single price can allow as many quantities to be exchanged O D. All of the above O E. Only A and C > Moving to another question will save this response