Concept:Volume of production is determined by the productive resources available to a firm, especially labour.
Explanation:Volume of production means the total quantity of goods that a firm produces within a given period.
The main factors affecting it include availability of raw materials, capital, technology, natural resources, and quality of labour.
Skilled manpower increases productive capacity and efficiency.
When the number of skilled workers is higher, output can increase.
A lack of skilled manpower reduces production volume.
Availability of forex and business location may affect cost or input supply, but they are not the primary factor.
Storage facilities are concerned with keeping goods after production, not with determining the quantity produced.
Therefore, among the options given, the number of skilled manpower is a recognised factor of production volume.
Answer:D. The number of skilled manpower.