Which of the following pairs of goods are most likely to be considered complements?

In economics, complements are goods that are often used together, meaning when the demand for one increases, the demand for the other also tends to increase. For example, think about peanut butter and jelly; when more people buy peanut butter, they usually buy more jelly to go with it. This relationship happens because these items enhance each other's use, making them more valuable when combined. On the other hand, substitutes are goods that can replace each other, like butter and margarine, where an increase in the price of one might lead people to buy more of the other instead. So when considering pairs of goods, look for those that people typically use together to identify complements.