ANS:D - All of these.

Fat Lime or Rich Lime or White Lime or Very Pure Lime contains 95% Cao and Quick Lime or Pure Lime or Caustic Lime Obtained After Cancination of Limestone. Fat lime, white lime and rich lime are same thing. They are used for white washing. So all of these option is right. Fat lime, Rich lime and White lime are same.
Fat lime contains high(rich) amount 95% Calcium Oxide, thus also called Rich lime.
Fat lime is white in colour and mostly used for whitewashing, thus called Whitewashing.
All are correct.