The eggshell is primarily composed of—

Correct option is B

• Eggshells are made mainly of calcium carbonate (CaCO₃), which contributes to the shell’s hardness and structural strength.
• About 94% of the eggshell is CaCO₃, deposited in crystalline form.
• The remainder consists of magnesium, protein matrix, and trace minerals.
• Lipids and proteins are present only in very small amounts and are not the primary shell component.