Q3. Hi pls help please do each wuestion in photo. will give thumbs up thanks!

Three engines operate between reservoirs separated in temperature by 300 K. The reservoir temperatures are as follows: Engine A: Th = 1000 K, T = 700 K Engine B: T = 800 K, T = 500 K Engine C: Th = 600 K, T = 300 K Rank the engines in order of their theoretically possible efficiency, from highest to lowest. OB > C > A OC > B > A O A > B > C OC > A >B