Question

Which sentence is written in a formal writing style?

Understanding the basics of Newton's Laws of Motion is about the best you can hope for.
Newton based his principal theories on the works of Copernicus, Kepler, and Ptolemy.
Most guys are more interested in Kepler than in Copernicus because Kepler was cooler.
I'm pretty sure Johannes Kepler's life story would make a great reality television show.

Answer 1

the awnser should be B; Newton based his principal theories on the works of Copernicus, Kepler, and Ptolemy.

Answer 2

The second sentence is the most formal one.

All the other sentences sound like the way that friends talk to each other casually.