Game theory

a. is best suited for analyzing purely competitive markets.
b. reveals that price-fixing among firms reduces profits.
c. reveals that mergers between rival firms are self-defeating.
d. is the analysis of how people (or firms) behave in strategic situations.

D. is the analysis of how people (or firms) behave in strategic situations.

Explanation:

Game Theory it one of the greatest concepts of social situations among the competitive individuals or firms. It is mostly about the strategies. It includes the science of strategy, optimal decision making among the competitive individuals or firms or maybe countries. Game Theory is very useful for determining the best solutions or paths for price competition or product releases. The Game Theory has well known pioneers like John Nash, John von Neumann.

Game Theory has:

Focus: the focus is the game that is happening. On the game, there are social interactions and rational players.

Key: one player's payoff is contingent on the strategy implemented by the other player.

Players: the individual or the firm who or what is strategic decision-maker within the context of the game

Strategy: it is the complete plan of action a player will obtain from the set of circumstances that might arise within the game

Payoff: The payout a player receives from arriving at a particular outcome  

Equilibrium: It is such an outcome or agreement that the point in a game where both players have made their decisions and an outcome is reached

As we see the game theory in general context is the behavioral analysis of the individuals and firms during the strategic situations.

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