When an oligopoly is in a nash equilibrium, a. firms have colluded to set their prices. b. a firm will not take into account the strategies of its rivals. c. firms will not behave as profit maximizers. d. a firm will choose its best pricing strategy, given the strategies that it observes other firms have taken.

Option D is the answer.

Step-by-step explanation:

An oligopoly is a market in which there are only a few sellers, with each seller offering a product similar or identical to the others.

So, When an oligopoly is in a Nash equilibrium, then - a firm will choose its best pricing strategy, given the strategies that it observes other firms have taken.

Note :

A Nash equilibrium occurs when no participant ( between different participants) can gain by a uniform change of strategy if the strategies of the others remain unchanged. The system is somewhat stable in this equilibrium state.

i belive those are the ones that are under 90 degreese.

1. minimum

2. 6400

3. eight

hope this !