Radio talk show host Winfra Opry promotes books on her show. Every show begins with Winfra reading the first chapter of a recently published book on air. Every book that was thus promoted became a national bestseller. In addition, Winfra's show pays royalties to the books' authors.

Which of the following conclusions is most strongly supported by the information above?

Books that are written by men are less likely to be chosen by Winfra to be promoted on her show.

Books whose first chapters are very long are less suitable for promotion through Winfra's show.

If a book is not promoted by Winfra on her show, its chances of becoming a best seller are lower than those of books promoted in Winfra's show.

The effectiveness of using the services of a public relations office to promote one's book is lower than the effectiveness of promoting a book through Winfra's show.

A recently published book that gains access to a promotional spot on Winfra's show is likely to become a bestseller.