Answer: In the Cournot model "A. firms' profits are interdependent.".
Explanation: The cournot model is a simpler model than the Oligopoly but they have the same bases, therefore companies are interdependent.
Interdependence means that the decisions taken by each of the companies affect the other and the final result of the market. Then the optimal choice of the price and quantity variables will depend on the characteristics of the market and on which variables the companies compete.