MULTIPLE CHOICE (identify the one best answer below and explain your reasoning for each option):

MULTIPLE CHOICE (identify the one best answer below and explain your reasoning for each option): Suppose that if Joe plays action A, then Helena has a payoff of 10 from playing action B, a payoff of 4 from action C, and a payoff of 10 from action D (she has no other actions available). We can then conclude that: a. C is not Helena's best response to A. b. B is Helena's best response to A. c. D is Helena's best response to A. d. All of the above. e. None of the above.