Question

is brown or black in color, is very slippery and a bit thick, with an oily smell.
a. engine oil
b. gasoline
c. diesel
d. coolant

Explanation:

Engine oil is typically brown or black, slippery, thick and has an oily smell. Gasoline is usually clear - to - light yellow and has a characteristic fuel smell, not oily in the same way as engine oil. Diesel is often a bit darker than gasoline but not as thick and slippery as engine oil. Coolant is usually colored (like green, orange etc.) and is not oily or thick like engine oil.

Answer:

A. Engine oil