Refining of petroleum is done in :

Options

A. Fractionating column
B. Zone refining column
C. Pronounce column
D. None of the above

Explanation

### Step-by-Step Text Solution:

1. **Understanding the Question**: The question asks where the refining of petroleum is conducted. Refining is a process that separates and purifies crude oil into various useful products.

2. **Identifying the Options**: The options provided are:
- A) Fractionating column
- B) Zone refining column
- C) Pronounced column
- D) None of the above

3. **Explaining the Refining Process**: Refining of petroleum primarily involves a process called fractional distillation. This process is carried out in a **fractionating column**.

4. **Describing Fractional Distillation**: In fractional distillation, crude oil is heated, and different components (fractions) are separated based on their boiling points. The vaporized components rise through the fractionating column and condense at different heights, allowing for the collection of various products like petrol, kerosene, and diesel.

5. **Evaluating Other Options**:
- **Zone Refining Column**: This is used for purifying metals, not petroleum. It involves heating and melting to achieve ultra-pure forms of metals like boron.
- **Pronounced Column**: This term does not relate to any known refining process for petroleum.
- **None of the Above**: Since the refining of petroleum is indeed done in a fractionating column, this option is incorrect.

6. **Conclusion**: Therefore, the correct answer is that refining of petroleum is done in a **fractionating column**.

### Final Answer:
The refining of petroleum is done in **A) Fractionating column**.