The correct answer is D. commercial markets.
A commercial market is a market that deals with the buying and selling of goods and services for commercial purposes. This includes markets for goods such as food, clothing, and electronics, as well as markets for services such as banking, insurance, and transportation.
A residential market is a market that deals with the buying and selling of homes. This includes both new and existing homes, as well as land.
A mortgage market is a market that deals with the lending of money to individuals to purchase homes. Mortgages are typically secured by the home that is being purchased, which means that the lender can take possession of the home if the borrower defaults on the loan.
An agriculture market is a market that deals with the buying and selling of agricultural products, such as crops and livestock. Agriculture markets are important for the global economy, as they provide food and other essential products to consumers around the world.
In conclusion, the correct answer is D. commercial markets. Commercial markets are markets that deal with the buying and selling of goods and services for commercial purposes. This includes markets for goods such as food, clothing, and electronics, as well as markets for services such as banking, insurance, and transportation.