Which of the following represents a positive feedback loop in the arctic that is associated with anthropogenic climate change?

Question: Which of the following represents a positive feedback loop in the arctic that is associated with anthropogenic climate change?

In climate change a feedback loop is something that speeds up or slows down a warming trend. A positive feedback accelerates a temperature rise whereas a negative feedback slows it down. This creates a feedback loop the warmer the temperatures the less sea ice. The less sea ice the more heat absorbed the higher the temperatures.