Information technology was widely introduced in the economy at the same time the growth rate of labor productivity slowed down. A possible explanation for this is that: a. the world supply of electricity could not keep up with the increased use of computers. b. one-story factories were poorly suited to accommodate the new technology. c. microprocessors were so slow that they actually hampered, rather than helped, work. d. for new technologies to increase productivity, they have to be used in new ways.