Examine the graph. Which development occurred in 1913 that best explains the dramatic decrease in the amount of time required to produce a single automobile? Time (in Minutes) Needed to produce a Single Automobile 800 700 600 the widespread use of the assembly line a sharp increase in demand for automobiles the adoption of laissez-faire policies in manufacturing a growth in the number of manufacturing jobs in the US 500 400 300 200 100 0 Before 1913 After 1913