WHY DOES THE AUTHOR MENTIONA BELL AND A RATTLEIN PARAGRAPH 1

Câu 5.Why does the author mentiona bell and a rattlein paragraph 1?A.To explain how babies distinguish between different nonhuman soundsB.To give examples of typical toys that babies do not likeC.To give examples of sounds that will cause a baby to cryD.To contrast the reactions of babies to human and nonhuman sounds