Final answer:
Saturated triglycerides contain single bonds between carbons and are solids at room temperature, while unsaturated triglycerides contain double bonds and are typically liquids, with trans fats being an exception as they are solids due to their linear configuration. The correct option is C.
Step-by-step explanation:
Saturated and unsaturated triglycerides differ in their structure and physical properties. Saturated triglycerides are composed entirely of single bonds between carbon atoms in their fatty acid chains, leading to a linear structure that allows them to pack closely together and be solid at room temperature.
In contrast, unsaturated triglycerides contain one or more carbon-carbon double bonds in their fatty acid chains. These double bonds can introduce bends in the chain, especially when they are in the cis configuration, preventing the triglycerides from packing tightly together.
This is why unsaturated triglycerides tend to be liquid at room temperature. Moreover, the presence of trans fats, a type of unsaturated fat with trans double bonds, also impacts the physical state, causing these fats to be solid due to a more linear fatty acid chain that can pack tightly.