Oil used to lubricate automobile engines is not biodegradable. What is the BEST way of disposing of this used oil?

A.
use it to paint a wooden fence to make it water repellant

B.
put it on the weeds in a park to kill the weeds

C.
take it to the local automotive parts store to be recycled

D.
pour it down the drain so it can go to the water recycling plant