Read the passage. Dan read the autobiography of a famous scientist. He loved reading the scientist’s description of his life’s work. Dan wanted to get the scientist to sign the book. He decided that his best chance of getting a signature would be at the scientist's autograph session at the library.

The word root auto means self. What is the best definition of autobiography as it is used in the passage?

a self-written life story
a self-scheduled session
a self-selected book from the library
a self-written signature on an item