If you chose all of these foods, you're right. Carbohydrates are the main energy source for the body, and they're the main source of calories in virtually every diet worldwide. They supply 4 calories per gram, the same as protein. Fiber, however, has no calories, because it isn't absorbed by the body. Dairy products are the only animal-derived foods with lots of carbs.
Table sugar is pure sucrose.
Much of the simple carbs we eat are sugars added to processed foods such as sodas, cookies, etc. Soda alone supplies about one-third of this added sugar. Complex carbohydrates, which are chains of simple sugars, consist primarily of starches as well as the fiber that occurs in all plant foods. Starch is the storage form of carbohydrates in plants. Usually, but not always.