(B) Plants are primarily composed of organic compounds such as carbohydrates, proteins, lipids, and nucleic acids. Carbon $(C)$ forms the structural b

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(B) Plants are primarily composed of organic compounds such as carbohydrates, proteins, lipids, and nucleic acids. Carbon $(C)$ forms the structural backbone of all these organic molecules. By dry weight, carbon constitutes approximately $45\%$ of the plant's total biomass, making it the most abundant element in plants.