Concept:The location of an industry is often determined by the need to stay close to essential inputs of production.
Explanation:Limestone is the primary raw material required for manufacturing cement.
It is heavy, bulky, and costly to transport over long distances.
Setting up a cement factory near limestone deposits reduces transportation expenses.
It also ensures a steady and convenient supply of the main raw material.
Such an industrial location is guided by the factor known as the source of raw material.
Market orientation, income source, and availability of capital are not the main reasons here.
The decisive factor is proximity to the raw material.
Answer:C. Source of raw material