The expression "pitch in with" in Paragraph 2 probably means（）

A．it can be eaten in the car
B．it is much more tasty than home- made food
C．one only uses his fingers while ,eating it
D．it is time - saving and convenient.

A．a car window from which you can see the driver
B．a window in the restaurant from which you get your takeout in the car
C．a place where you check the mechanic condition of your car
D．an entrance where you return the used plates after eating