Final answer:
Storage lipids, known as triglycerides, consist of three fatty acids ester-linked to a single glycerol molecule, forming hydrophobic molecules used for energy storage. The option (B) is correct.
Step-by-step explanation:
The structural features of storage lipids are that they are composed of three fatty acids ester-linked to a single glycerol molecule. This structure is known as a triglyceride, or triacylglycerol, which is a type of lipid used for long-term energy storage in cells.
Triglycerides are hydrophobic molecules and do not have a charged head group, distinguishing them from phospholipids, which have two fatty acids, a glycerol backbone, and a charged phosphate group that renders them amphipathic. Therefore, the correct answer to the student's question is B. Three fatty acids ester-linked to a single glycerol.