Suppose a white blood cell destroys invading bacteria by phagocytosis. Which statement best describes this process?

a
The white blood cells are using active transport, and therefore are using energy.
b
The white blood cells are using osmosis and therefore are using energy.
c
The white blood cells are using passive transport and therefore are not using energy.
d
The white blood cells are using diffusion and therefore are not using energy.

The best statement that describes this process is:

a) The white blood cells are using active transport, and therefore are using energy.