According to the graphs, which of the following is the best estimate of the total number of employees in 1990

A． acknowledge the fact that human reliance on computer technology is completely safe
B． emphasize the idea that it is dangerous for humans to rely so heavily on computer technology
C． cast doubt on the accuracy of any personal data collected on the Internet by criminals
D． criticize human technological advances in the areas of education, medicine, and national security
E． disprove the theory that computer technology is unnecessary for human advancement