Questions: Findings from The Nurses' Health Study found that women who consumed the most antioxidants, monounsaturated fatty acids, polyunsaturated fatty acids, fiber were least likely to develop heart disease.

The answer is the second one: monounsaturated fatty acids.

Explanation for each option:

1. Antioxidants: While antioxidants are beneficial for health and can help reduce oxidative stress, the specific finding from The Nurses' Health Study regarding heart disease risk is more closely associated with types of fats rather than antioxidants.

2. Monounsaturated fatty acids: The Nurses' Health Study and other research have shown that diets high in monounsaturated fats, such as those found in olive oil, avocados, and certain nuts, are associated with a reduced risk of heart disease. This is because monounsaturated fats can help lower bad cholesterol levels and provide other cardiovascular benefits.

3. Polyunsaturated fatty acids: These fats, found in foods like fish, walnuts, and flaxseeds, are also known to be heart-healthy. However, the specific finding from the study in question highlights monounsaturated fats as having a more significant impact on reducing heart disease risk.

4. Fiber: While fiber is important for overall health and can help reduce the risk of heart disease by improving cholesterol levels and promoting a healthy weight, the specific focus of the study's finding is on the type of fat consumed.

In summary, the study found that women who consumed the most monounsaturated fatty acids were least likely to develop heart disease.