What type of fatty acid contains carbon-carbon double bonds?

The correct answer is unsaturated fatty acids, which are characterized by the presence of one or more carbon-carbon double bonds in their structure. These double bonds can affect the physical properties of the fatty acids, making them generally liquid at room temperature, as opposed to saturated fatty acids, which have no double bonds and are typically solid at room temperature. Unsaturated fatty acids can further be categorized into monounsaturated (one double bond) and polyunsaturated (multiple double bonds).

Focusing on the other options, saturated fatty acids, as previously mentioned, do not contain any double bonds. Trans fatty acids, which are a type of unsaturated fat, have specific configurations that can occur due to hydrogenation but are still classified as unsaturated due to the presence of double bonds. Omega-3 fatty acids are a specific type of polyunsaturated fatty acid known for their health benefits, but they are still categorized under the broader group of unsaturated fatty acids. Thus, while they have significance in dietary considerations, they are not distinct from the definition of unsaturated fats.