Question

il can be put in a container and taken to a mechanic for proper disposal. in what way is this practice most t
e oil can be reused in other cars.

e total amount of oil used by car owners will not increase.

impurities in the oil can be studied to improve car engine design.

recycling the oil helps to protect the environment.

Explanation:

The problem is about the environmental impact of proper oil disposal. Environmental Sciences (a subfield of Natural Science) deals with practices that protect the environment. Recycling oil to protect the environment aligns with environmental science principles. Other options: reusing in other cars isn't typical for used oil, total oil use not increasing is not the main benefit, and studying impurities for engine design is not the primary reason for proper disposal.

Answer:

recycling the oil helps to protect the environment.