Please choose the correct answer to the question: Brittany pedaled her bicycle quickly on a level surface. When she stopped pedaling and coasted, the bicycle slowed and came to a stop. What happened to the energy of the moving bicycle as it coasted to a stop?

Answer1: It was transferred to heat due to friction. Answer2: It was reabsorbed into Brittany's muscles. Answer3: It was stored in the bicycle wheels as potential energy. Answer4: It was transferred to the air in the form of visible light.

Answer format: answer1/answer2/answer3/answer4
Answer: answer1