Final answer:
Unsaturated fats contain unsaturated fatty acids, making them a key component of oils and remaining liquid at room temperature, unlike solid saturated fats.
Step-by-step explanation:
The correct answer is: b) Unsaturated fats; oils; liquid. Unsaturated fats contain at least one unsaturated fatty acid with one or more double bonds, creating a kink that prevents tight packing. Consequently, these fats cannot stack as closely together as saturated fats which are solid at room temperature. Unsaturated fats are a major component of oils and are liquid at room temperature.
Examples include oils from plants such as olive oil, which typically contain both mono- and polyunsaturated fatty acids. In contrast, saturated fats contain no double bonds and are usually solid at room temperature, such as lard and butter.