One Reason for the Decline in Output with the Seventh

One reason for the decline in output with the seventh machine in Exhibit 13­2 could be that

A) the increase in the company's power consumption when seven machines are being used causes its electricity bills to be much
Higher
B) the increase in the company's power consumption when seven machines are being used causes fuses to blow more often
C) no one uses the seventh machine; only six are necessary
D) no one uses the seventh machine; only five are necessary
E) workers no longer have to wait in line to make copies because more machines are available