Answer:
correct answer is d. collusion
Step-by-step explanation:
Nextflix and Flixbuster both did an agreement for supply every 250 subscriptions so it is collusion because collusion is that when 2 or more companies get together and make a secret agreement
and it is possibly unethical so collusion is an illegal practice and there is Antitrust law to preventing collusion between 2 or more companies
because these type of company operate to detriment of the third party
and these type of secret agreement occur for sale and purchase and advertising
so correct answer is d. collusion