Answer:
The correct to answer to the following question is option A) Tacit collusion .
Step-by-step explanation:
Tacit collusion ( which is also know as price leadership ) can be defined as the situation where a dominant firm in the market will set a price and other firms in the market would accept those changes in the price. Here the dominant firm usually sets high price, such that the firms who are least cost efficient would also be able to earn some return.