Answer: The purpose of a commercial is to convince the audience of buying a product or service by describing its benefits.
Explanation: A commercial is a television or radio advertisement in which the positive traits of a product or service are highlighted in order to persuade the audience to buy that product or service. In other words, the purpose of a commercial is<u> to make an important profit, that is to say to earn a huge amount of money by offering goods to the general public.</u>
"A. childrens'" is the proper answer because the musem belongs to the children, which is plural. If a single child owned the museum somehow, it would be The Child's Museum.