Answer:
D) product placement
Step-by-step explanation:
Tony Stark (Iron Man) drives Audi cars not because he necessarily likes them, but because the movie producers are paid for using those cars. That practice is called product placement and happens not only with expensive cars, but it includes other smaller products like PCs, watches (James Bond and Omega watches), cellphones, beer, etc.
Certain movie franchisees charge millions of dollars for product placement, the most notorious (and obvious one) is the James Bond franchise that charges money for using cars, beers, vodka, clothes, PCs, smartphones, watches, purses and wallets, guns, and about every product included in the movie. The last Bond movie made $78 millions through product placement.