Question

old units and components
old units and components such as batteries, catalytic converters, used air - bags, etc. can be disposed by sending them to local disposal facility, recycler or community drop - off centers.
cleaning products
parts cleaners and vehicle wash products are often toxic and some are flammable. they can not be disposed in regular trash or washed down the drain. small and large quantities of liquids leftover can be collected in sealed containers and send to your local waste disposal facilities.
volatile materials
the main volatile wastes in a motor vehicle is the vehicle fuel and the components that have contact with it, these components including: fuel filter, fuel tank, fuel pump, fuel lines, fuel injectors, etc... because the high flammability of these waste, they should be treated with extra care! keep them away from any source of heat or fire. do not dispose of them in regular trash or bury them in the soil. send them to professional disposal facilities or check with your local authority for more information.
2
which of the following substances used in vehicle maintenance are considered hazardous?
battery electrolyte.
brake clean
brake fluid.
gasoline, diesel and other vehicle fuels.
engine oil.
atf (automatic transmission fluid).

Explanation:

The text mentions that substances like parts cleaners (which could include brake - clean), vehicle fuels (gasoline, diesel), and various vehicle fluids (brake fluid, engine oil, ATF) are often toxic, flammable or have other hazardous properties. Battery electrolyte is also a hazardous substance due to its chemical nature.

Answer:

A. Battery electrolyte, B. Brake Clean, C. Brake fluid, D. Gasoline, diesel and other vehicle fuels, E. Engine oil, F. ATF (automatic transmission fluid)