The Harrisons live in a country where they are the only business allowed to supply consumers with leather shoes. What type of economy is this an example of?

Its D) Monopoly ... I think, ill change it if im wrong

The type of economy that the Harrisons live in is a monopoly. A monopoly is when only one company offers a specific service or sells a specific product, in this case shoes. Since there is no competition, the seller has complete control over the price.