**Core Concept**
Monounsaturated fatty acids (MUFAs) are a type of fatty acid characterized by having one double bond between carbon atoms. This structural feature makes them distinct from saturated and polyunsaturated fatty acids. MUFAs are essential components of various biological processes, including lipid metabolism and energy production.

**Why the Correct Answer is Right**
MUFAs are metabolized through beta-oxidation, which involves the sequential removal of two-carbon units from the fatty acid chain. This process is facilitated by the enzyme acyl-CoA dehydrogenase, which is specific to the alpha-beta unsaturated bond in MUFAs. The correct answer contains examples of MUFAs, which are primarily found in plant-based foods and certain animal products.

**Why Each Wrong Option is Incorrect**
**Option A:** Saturated fatty acids have no double bonds and are typically found in animal products and processed foods.
**Option B:** Polyunsaturated fatty acids have multiple double bonds and are primarily found in fish oil and flaxseed oil.
**Option C:** Trans fatty acids are created during partial hydrogenation of unsaturated fatty acids and are commonly found in processed snack foods.

**Clinical Pearl / High-Yield Fact**
MUFAs are beneficial for heart health due to their ability to lower LDL cholesterol levels and improve insulin sensitivity. Foods rich in MUFAs, such as avocados and olive oil, can be incorporated into a healthy diet to promote overall cardiovascular well-being.

**Correct Answer: C. Oleic acid, Palmitoleic acid, Stearic acid**