Which of the Following May Result in a Positive Feedback

Multiple Choice

Which of the following may result in a positive feedback mechanism that would intensify climate change?

A) A large volcano emits huge quantities of sulfate aerosols into the atmosphere.
B) Warmer temperatures result in the melting of permafrost.
C) Warmer temperatures result in increased evaporation of water,leading to an increase in cloud cover.
D) An increase in rainfall results in increased plant growth.
E) At higher temperatures,trees increase rates of photosynthesis.