The correct answer to this question is B, Yellow. It would be easy for one to get this question wrong, for the bus shown and the colors of it differ than the context of the question. Like all other students attending school, kindergartners would ride the yellow school bus.
However, the image shown is of a different bus. It is a picture of a Greyhound bus, and it is the color white and blue. These type of buses are used for trips and professional sports team. It would not be used to take kindergartners to school. If a person wasn't familiar with school buses, they might get this question wrong.