The answer would be : Radio Media led to the end of Print Media
Radio did not end the print media. The development of digital media such as Website's encyclopedia, Ebook and PDF Formats, handheld tablets that could contain over 100,000 books in one tablet, etc
The correct answer is simple sentence. It is a type of a sentence called elliptical sentence, and can stand on its own while still conveying meaning. Similar situation to this would be "Fire!" or "Look out!".
The answer is A, The thesis states what a paper will be about, and the writers take on the subject. (ex. School uniforms are good for all schools because they promote equality)