Answer:
(C) Estimating and managing future demand.
Explanation:
Marketing is basically analyzing the demand of the consumers and then supplying it at maximum to get the maximum profit.
This involves some main steps, in which the most essential is the planning, which involves about estimating and managing the demand and then the entire plan of production, supply of commodity.
Thus, the most important step in marketing is to estimate the demand and supply, and then managing the future demand basically.