Can we draw the following hypothesis from the context? 

Context:

Christopher James Paolini (born November 17, 1983, Los Angeles, California) is an American author. He is the author of the "Inheritance Cycle", which consists of the books "Eragon", "Eldest", "Brisingr" and "Inheritance". He currently lives in Paradise Valley, Montana, where he wrote his first book.

Hypothesis: "Eragon" sold the most copies out of the entire "Inheritance Cycle" books.
It's impossible to say