Q:Question: Elizabeth rolled an egg down a marble countertop in the kitchen. She then moved the egg to the knitted rug in the living room. She noticed that the egg moved faster on the countertop than on the rug. On which surface was more heat generated? (A) countertop (B) rug  Do not use A and B to answer the question but instead, choose between "marble countertop" and  "knitted rug".
A:
knitted rug