Which of the following is an example of a shortage? the price of oil going up because more people are driving cars the price of grain going down when supplies are scarce having a sale on soda because there are too many cases on the shelf not having enough of one brand of soda in the store because of a sale

The correct answer here is, indeed, the last one: Not having enough of one brand of soda in the store because of a sale.

Explanation:

The explanation for this answer comes from the definition of what an economic shortage is, and how it happens. In essence, an economic shortage is defined as the lack, or deficiency, in the provision of a specific product, or service, by a seller because of the high demand of said product, which he/she cannot  meet. These shortages can happen particularly during sales, because prices go down, demand is up, but the providers of the good cannot, or will not, meet the demand. In this case, the lack of a soda brand comes from a sale, which means that the price of the soda was down, and therefore, the demand went up, but the store did not have enough sodas in stock to meet the demand. This is why the correct answer is the last one.