Answer:
c) a demand forecast.
Step-by-step explanation:
The demand forecast is a technique which is used to estimate the probable demand for a service or product in the future.
The basis for the demand forecast is the past analysis available about the demands i.e the growth rate of demand, factors affecting the demand and variations in demand over the period.
Here in the question the demand forecast is required so that the estimate of new staff to be hired can be calculated required for the production of the demand in future.