Explanation:

- Wood: While wood is used as a fuel, it's more common in residential and small-scale applications, not typically in industries.

- Coal: Historically the backbone of industrial fuel, coal is still widely used in sectors like power generation and steel production. It remains a major industrial fuel.

- Oil: Oil is another major industrial fuel, versatile and widely used in various industries for its energy density.

- Kerosene: Primarily used for lighting and heating, kerosene is not as common in industrial settings.

The correct answer is:

- Coal (Option 2): Coal remains the most common and popular industrial fuel worldwide due to its abundance and energy output.