Concept:Cement plants are located near their raw material sources because those materials are heavy and bulky.
Explanation:The main raw materials for cement are limestone and clay.
These materials lose much of their weight during processing.
Transporting them over long distances is expensive and not economical.
The finished cement is lighter and can be moved to markets cheaply.
Therefore, the source of raw materials is the most important locational factor.
A cement factory is best placed near quarries where limestone and clay are available.
Capital, market, and labour are less important because they are easier to obtain or transport.
Answer:B. source of raw materials