Dont have anything around you that can distract you from what you are currently doing. focus on one thing at a time
Your answer is D :) hope this helps
I don't think it should be taken at face value because those ways could be the main ways to earn money, but it could probably be the least reliable or successful ways. This sentence could just be a lie taken literaly in which has a hidden meaning. This could be a meaning that you might not get, in which will leave you ripped off.
