The Most Common Measure of Productivity Is ________,Which Can Be

The most common measure of productivity is ________,which can be measured as real GDP divided by ________.

A) indexed productivity; per capita output
B) factor productivity; the total number of factors employed in the economy
C) capital productivity; the number of units of capital employed in the economy
D) potential productivity; the total number of factors that would be employed in the economy at full employment
E) labour productivity; the number of units of work effort