Which of the Following Is a Correct Example of Global

Which of the following is a correct example of global warming creating a positive feedback?

A) Warming air melts permafrost releasing methane, a natural absorber of potent greenhouse gases.
B) Less water evaporating will create more high level clouds causing the surface to warm.
C) Warming oceans release more water vapor, a potent greenhouse gas which absorbs longwave radiation, further increasing temperature.
D) Warming oceans release less water vapor, a potent greenhouse gas which absorbs longwave radiation, further increasing temperature.