The fuel used in cement factories, steel mills and glass factories is ______

Options

A. LPG
B. Wood
C. Coal
D. CNG

Explanation

To answer the question "The fuel used in cement factories, steel mills and glass factories is ______," we can analyze the options provided: LPG, wood, coal, and CNG.

**Step 1: Understand the context of the question.**
- Cement factories, steel mills, and glass factories are industrial facilities that require substantial energy for their operations.

**Hint:** Consider the energy requirements of heavy industries and the types of fuels typically used.

**Step 2: Evaluate the options.**
- **LPG (Liquefied Petroleum Gas):** This is a cleaner-burning fuel but is generally not used for heavy industrial processes.
- **Wood:** While it can be used as a fuel, it is not efficient for large-scale industrial processes and contributes to pollution.
- **Coal:** This is a common fuel used in heavy industries due to its high energy content and availability.
- **CNG (Compressed Natural Gas):** This is cleaner than coal but is not typically used in large quantities for industrial processes like cement and steel production.

**Hint:** Think about the energy density and availability of the fuels in relation to industrial needs.

**Step 3: Identify the most suitable fuel.**
- Among the options, coal is the most widely used fuel in cement factories, steel mills, and glass factories due to its high energy output and cost-effectiveness.

**Hint:** Consider which fuel is traditionally associated with heavy industrial processes.

**Conclusion:**
The fuel used in cement factories, steel mills, and glass factories is **coal**.

**Final Answer: Coal**