Some Have Suggested That the Exploitation of a Backlog of Technological

Some have suggested that the exploitation of a backlog of technological opportunities following the Great Depression and World War II led to ________ productivity growth rates in the 1950s and 1960s,followed by _________ productivity growth rates since the 1970s.

A) normal;unusually high
B) normal;unusually low
C) unusually high;a return to normal
D) unusually high;unusually low
E) unusually low;a return to normal