Which is the correct way to complete the paragraph below?

How to Become a Pro Gamer

Easy to understand, that is. for a living ísn't all fun and games. It takes time, skill and determination in today's competitive circuits. If you're up for the challenge, here's what you need to do.

(Adapted from http://iq.intel.com/want-pro-gamer/?sr_source=lift_gravity&v=3)