Data on miles of main line track in operation between 1860 and 1910 show that
A) total mileage first increased and then decreased, causing the growth rate to eventually become negative.
B) total mileage and the growth rate both increased steadily.
C) total mileage increased steadily, but the growth rate tapered off.
D) total mileage increased at a constant pace, resulting in a nearly constant growth rate.

Question

Quizplus · Accepted Answer

Total mileage of main line track in operation increased steadily during this period due to the expansion of the railroad system across the United States. However, the growth rate tapered off because, as the railroad network became more developed and extensive, the rate of new track being added each year decreased relative to the already large total mileage.

Data on Miles of Main Line Track in Operation Between