The correct answer is: A. insufficient capacity.
Insufficient capacity is a limiting factor in a plant when the plant is not able to produce enough goods or services to meet the demand. This can be due to a number of factors, such as a lack of workers, machinery, or raw materials.
A shortage of experienced salesmen is not a limiting factor in a plant. Salesmen are responsible
for selling the plant’s products or services, but they do not directly affect the plant’s production capacity.A general shortage of power is not a limiting factor in a plant. Power is an essential input for many plants,
but it is not the only input. Plants can also use other sources of energy, such as natural gas or oil.A shortage of materials is a limiting factor in a plant. Materials are essential inputs for many plants, and if they are not available, the plant will not be able to produce goods or services.
In conclusion, the correct answer is: A. insufficient capacity.