question: Why does Dave leave Jane's house after only an hour?
story: Today, Anne is hungry. She wants to eat somewhere in town.\newline\newlineThere is a popular diner in town. She goes there and asks them if she can get fries and a\newlinechocolate milkshake.\newline\newlineHer friends come into the diner and sit with her. Their names are Jane, Jake and Dave. All\newlineof them are 15 years old.\newline\newlineJake gets a big cheeseburger with onions. Jane wants a vanilla ice cream cone with\newlinesprinkles. Dave doesn't eat anything. He talks with them instead.\newline\newlineAfter they finish eating, they go back to Jane's house to hang out and play games. Dave\newlinewins most of the puzzle games. Jane beats them at a few. They're racing games.\newline\newlineDave leaves after an hour. He needs to go do his reading homework. Jake and Anne leave\newlinethat evening because it's a school night. They all promise to meet up again the next day\newlineto hang out after school.
answer_options.A: he has to do his reading homework
answer_options.B: he has piano practice
answer_options.C: the others don't like him
answer_options.D: his mother is waiting for him