The correct answer is d) fats (triglycerides).
Fats, specifically triglycerides, are the primary form of long-term energy storage in humans. They are stored in adipose tissue and can be broken down into fatty acids and glycerol when the body needs energy. While carbohydrates like starch provide quick energy, they aren’t as efficient for long-term storage. Proteins and nucleic acids serve different roles in the body; proteins are primarily used for building and repairing tissues, while nucleic acids are involved in genetic information and protein synthesis. Therefore, option e) b and d is incorrect because starch does not serve as long-term energy storage like fats do.