Measured Productivity Growth for the United States Declined Following the Great

Measured productivity growth for the United States declined following the Great Recession.Which of the following explanations for that phenomenon suggests that measured productivity has failed to account for actual gains?

A) high debt levels, accumulated prior to the Great Recession
B) creation of new products that are essentially free to consumers
C) overcapacity of firms, implying a greater ability to produce than is currently measured
D) stalled technological progress that has encouraged greater consumption of leisure activities