Use economic reasoning to explain why nearly every purchase you make provides you with consumer surplus.?

The answer is A. When you measure the benefits of buying something, you always want to make sure you are getting something out of it. Take reading an article for example. If you decide to not play video games to read the article, you are gaining whatever knowledge that article has in it, which could outweigh the video game. You want more for your money, so if you are buying something that is worth being bought, you are gaining more than spent. Simple economics.