Labor Productivity in the United States Has

Labor productivity in the United States has:

A) been growing at ever-increasing rates since World War II.
B) been growing but at lower rates in the last 25 years compared to the 25 years immediately after World War II.
C) been falling for the last 50 years.
D) remained largely unchanged over the last 50 years.
E) been growing more rapidly in the last 50 years than in most other developed economies.