## **Core Concept**
The question tests knowledge of the fatty acid composition of various oils and fats, specifically focusing on polyunsaturated fatty acids (PUFAs). PUFAs are essential fatty acids that play critical roles in reducing inflammation and supporting heart health. They are categorized mainly into omega-6 and omega-3 fatty acids.

## **Why the Correct Answer is Right**
Among the given options, **C. Safflower oil** stands out for its exceptionally high content of polyunsaturated fatty acids. Safflower oil is predominantly composed of PUFAs, with a high percentage of both omega-6 (linoleic acid) and a smaller amount of omega-3 fatty acids. This oil is often used in cooking and as a dietary supplement due to its health benefits, including lowering cholesterol levels and reducing the risk of heart disease.

## **Why Each Wrong Option is Incorrect**
- **Option A:** While **A. Groundnut oil (peanut oil)** does contain a significant amount of unsaturated fats, its polyunsaturated content is not as high as that of safflower oil. It has a balanced mix of monounsaturated and polyunsaturated fats but is not the highest in PUFAs.
- **Option B:** **B. Mustard oil** contains a mix of monounsaturated and polyunsaturated fats, with a significant amount of erucic acid (a monounsaturated fatty acid). Although it has health benefits, its PUFA content is not the highest compared to other options.
- **Option D:** **D. Coconut oil** is primarily composed of saturated fats, making it one of the lowest in polyunsaturated fatty acids. It is not considered a significant source of PUFAs.

## **Clinical Pearl / High-Yield Fact**
A key point to remember is that while PUFAs are beneficial, a balanced intake between omega-6 and omega-3 fatty acids is crucial for health. Excessive intake of omega-6 fatty acids, without a corresponding increase in omega-3 fatty acids, can lead to an increased risk of inflammation and chronic diseases.

## **Correct Answer:** C. Safflower oil.