The Three Waves of Suburbanization Occurred in Which of the Following

The three waves of suburbanization occurred in which of the following orders?

A) automobiles facilitating development of outlying areas, followed by exit ramp economies, followed by retail locating in outlying areas
B) automobiles facilitating development of outlying areas, followed by retail locating in outlying areas, followed by exit ramp economies
C) exit ramp economies, followed by automobiles facilitating development of outlying areas, followed by retail locating in outlying areas
D) retail locating in outlying areas, followed by exit ramp economies, followed by people moving out to retail areas