Final answer:
Lipids, which are important macromolecules, serve various functions including energy storage and forming cell membranes. They are hydrophobic and insoluble in water. The correct answer to the student's question is D. Proteins, Lipids, Energy, Membranes.
Step-by-step explanation:
Lipids are a complex group of macromolecules that are significant for multiple functions within the body and cells. They are hydrophobic and insoluble in water due to their nonpolar nature, consisting mostly of nonpolar carbon-carbon or carbon-hydrogen bonds. As major components of cell membranes, lipids are also key to long-term energy storage, act as insulation for organisms, and are precursors to many hormones. Given the information, option D. Proteins, Lipids, Energy, Membranes fits the best as the correct completion for the blank spaces in the student’s question.