Answer:
The correct answer is option a.
Step-by-step explanation:
Productivity can be defined as a measure of the efficiency of a person, factory, machine, system, etc, to convert inputs into outputs. In other words, it is the rate of output per unit of input.
Productivity is an important determinant of living standards. A higher level of productivity means better living standards. This implies that growth in productivity is the key determinant of growth in living standards.