Concept:Heavy industries depend on a large and steady supply of power or fuel for operating heavy machines and production processes.
Explanation:Heavy industries use massive equipment and often require intense heat for smelting, refining, or manufacturing.
Coal has historically been the main source of energy used to run these industries.
They are capital-intensive, not labour-intensive, so option D is incorrect.
They may use electricity, but it is not obtained only from generators, so option C is incorrect.
Although raw materials matter, the crucial requirement is abundant power or fuel, making option B less appropriate.
Answer:A. mostly coal to run them