Which is a thesis statement?

a. The following essay describes how popular horror novelist Stephen King, author of Carrie, Misery, and The Shining, built a successful career as a full-time author.

b. Stephen King is the world's most renowned horror author thanks to his impressive literary output, many awards, and the numerous film adaptations of his work.

b. Stephen King is the world's most renowned horror author thanks to his impressive literary output, many awards, and the numerous film adaptations of his work.