What role does heat play in the formation of convection currents?
Choose the correct answer.

A. When water loses heat, it becomes denser and sinks.

B. When water gains heat, it becomes denser and sinks.

C.When water loses heat to cooler water, the cooler water becomes denser and sinks.

D. When water gains heat, it dissolves more solids and gases, becomes denser, and sinks.