Productivity is defined as: A. number of items manufactured per day B. output per man-hour of labour C. cost per day D. cost per unit E. None of the above

The correct answer is: B. output per man-hour of labour.

Productivity is a measure of the efficiency of production. It is calculated by dividing the output of goods or services by the input of labor, capital, or other resources.

Option A is incorrect because it measures the number of items manufactured, not the efficiency of production.

Option C is incorrect because it measures the cost of production, not the efficiency of production.

Option D is incorrect because it measures the cost per unit, not the efficiency of production.

Option E is incorrect because it is not a valid option.