Why is this the answer?

The answer is choice because this is a wonderful word puzzle that helps us think about making decisions every day. A choice is simply when you get to pick one thing from a group of options. We make little choices all the time, like what shirt to wear or which toy to play with first. Let's look closely at the first part of the riddle: "What is it that given one…" This means that someone is giving you a single opportunity or question that needs you to decide. For example, a teacher might ask the class, "Do you want to do the math worksheet or the reading activity?" She is offering the class one chance to make a decision. Now for the next part: "…you'll have either two or none." When you are "given one" choice, it usually means you have two things to pick between. Just like with the teacher, you have the math option and the reading option. These are your two paths. The "given one" moment instantly creates "two" possibilities for you to select from. This is often the case with important decisions, like choosing a favorite sport or deciding if you will say yes or no to an invitation. The "or none" part is the most brilliant part of the riddle. It means two things. First, once you make a choice, the other option is gone, or 'none' of the other options remain for you to take. If you choose the reading activity, the math worksheet option is finished. Second, and even more interesting, if you are given a choice and you simply refuse to pick one, then you end up with nothing. If the class cannot agree on math or reading, the teacher might just have them sit quietly, and they will have none of the fun activities. Not making a choice means you lose all the possible outcomes. This fun riddle reminds us that a single choice has the power to create and also take away options.