问题详情

Which of the following statements can be inferred from the data？ I. The greatest increase in total yearly revenue over any 10-year period shown was $7 million. II. In each of the 10-year periods shown in which total yearly revenue increased, the average number of production hours per widget decreased. III. From 1980 to 1990, fewer widgets were sold because each widget took longer to produce.
A．I only
B．II only
C．III only
D．I and III
E．II and III请帮忙给出正确答案和分析，谢谢！