I agree with Aditya Gour. The first sentence is correct. We typically say "on the bus/train/plane." However, the second sentence is not incorrect either. I think there would be a reason for using "in." Miss Moss is reading newspapers inside, not outside, the bus.

I love to argue and say that "on the bus" is totally correct and how it is said but technically the person is "in" the bus but it doesn't matter. With language its about how people speak that makes it correct

They are both correct. Because that's how people speak. If someone was actually on top of the bus they would say " on top of the bus"

yes I know first one is correct because it is bus in which we easily walk that's why it is correct

yes I know first one is correct because it is bus in which we easily walk that's why it is correct