Final answer:
Without additional context or reference to a particular game, book, or script, it is impossible to determine how many players were on base when Denny told Matt they had to leave the game early.
Step-by-step explanation:
The question: "When Denny told Matt that they would have to leave the game early, how many players were on base at the moment?" lacks the necessary context to provide a specific numeric answer. This question could refer to any game with bases such as baseball or softball, and without additional information about the specific game being played or the events leading up to the moment in question, it's impossible to accurately determine how many players were on base.
For such situational questions, it is important to reference the specific game or situation for context. If this is from a book, script, or a problem set, consulting the appropriate text will reveal the exact number of players on base at that moment in the narrative or scenario.