One Plausible Explanation of the Canadian Productivity Slowdown Starting in 1973

One plausible explanation of the Canadian productivity slowdown starting in 1973 is that it was the result of the time needed to adapt to new technology.This explanation would require that

A) workers withdraw from the labor force to learn about the new technology.
B) a large number of new entrants be attracted to the labor force.
C) managers be reluctant to adopt changes.
D) workers time at their jobs be diverted from production to learning the technology.
E) little time was spent to learn the new technology.