Which of the Following Best Describes Spring Turnover

Multiple Choice

Which of the following best describes spring turnover?

A) As ice on the surface of a body of water melts, it reaches 4 degrees Celcius, the temperature at which water is most dense, and it sinks to the bottom, pushing deeper water toward the surface.
B) Water at the surfaces of water bodies warms along with air temperatures, and new life begins to grow in the warmer water.
C) Fallen leaves from the previous season begin to deteriorate and provide nutrients for new members of ground-dwelling animals and fungi.