Final answer:
Triglycerides (Option B) are the lipids used by the body for insulation. They consist of a glycerol molecule and three fatty acid chains, functioning as the main component of body fat and providing energy storage and thermal insulation.
Step-by-step explanation:
The type of lipid used by the body for insulation is triglycerides (Option B). Triglycerides are formed from a glycerol molecule linked to three fatty acid chains, and they represent the main constituent of body fat in humans and other animals.
They are also present in plant fats and are important in various functions such as energy storage and providing thermal insulation. While phospholipids are crucial for forming cell membranes and steroids like cholesterol are important for membrane fluidity and as precursors to hormones, it is specifically triglycerides that are used for insulation in the body.
Carotenes are pigments and not primarily used for insulation, and bile salts aid in digestion. Fat stored in the adipose tissue provides insulation to maintain body temperature, making triglycerides vital for survival in colder environments.