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Which one of the following statements is correct for the rib cage?

A) There are eleven pairs of thick bones in the rib cage.

B) Out of eleven pairs only 4 pairs of bones are attached to the backbone at the back and flat breast bone in the front.

C) Last two pair of ribs at the bottom of the rib cage are joined only to the backbone but not to the breast bone.

D) Rib cage protects the internal organs like kidneys and lungs.

E) None of these