Answer:
(D) The game had been played since its inception with a rubber ball.
Step-by-step explanation:
Considering the scenario described in the question above, the conclusion reached above depends on the assumptions that "The game had been played since its inception with a rubber ball."
Given that the conclusion stated that "the game must have originated sometime between approximately A.D. 1000 and Cortez’ arrival."
This implies that the pre-Columbian inhabitants of Mexico only began playing the game following the advent of using rubber to make its ball and not before.