What Is the Direct Manufacturing Labour Partial Productivity, Assuming 20,000

What is the direct manufacturing labour partial productivity, assuming 20,000 widgets were produced during the year and 80,000 direct manufacturing labour-hours were used?

A) 0.25 unit per direct manufacturing labour-hour
B) 0.50 unit per direct manufacturing labour-hour
C) 0.75 unit per direct manufacturing labour-hour
D) 4.00 unit per direct manufacturing labour-hour
E) 1.25 unit per direct manufacturing labour-hour