Question

which of the following are complementary goods and/or services?
cars and motorcycles
cars and bus transportation
cars and car tires
cars and taxis
i dont know yet

Explanation:

Complementary goods are those that are used together, so an increase in the demand for one leads to an increase in the demand for the other. Cars require car tires to function, so they are complementary. Cars and taxis, cars and motorcycles, and cars and bus transportation are substitutes (they can replace each other in use).

Answer:

Cars and car tires