Which of the following statements is an unqualified thesis statement for an essay?

A、The exploration of outer space is a waste of money.

B、Overemphasizing competitive sports may be harmful to the development of young children.

C、Wireless cable is a means of transmitting television signals through the air by microwave.

D、Although different in purpose, weddings and funerals each draw families together and confirm family values.

正确答案：Wireless cable is a means of transmitting television signals through the air by microwave.