From a Time- Series Graph Showing Sales of Shoes in Dollars

Multiple Choice

From a time- series graph showing sales of shoes in dollars on the vertical axis, it is not possible to tell

A) the changes in sales over time.
B) the level of sales at a given time.
C) the speed of change in sales over time.
D) None of the above answers is correct because it is possible to tell all of the above from the time- series graph described.