Why is carbon considered the fundamental building block of life in biological molecules?

• A. It forms weak bonds with other elements, allowing for flexibility in molecular structures.
• B. It can form four covalent bonds, allowing for the construction of complex and stable molecules.
• C. It is the most abundant element in the universe, making it easily available for biological systems.
• D. It dissolves easily in water, enabling efficient transport within cells.

Answer: (B)