Which of the Following Transactions Would Occur in a Product

Which of the following transactions would occur in a product market?

A) Getting a job at the local ice cream shop.
B) Paying tuition at a local college so that you can take an art course that you'd really enjoy.
C) Contracting with someone to develop a website for a business you run out of your home.
D) Selling a machine you designed to a manufacturer so that it can lower its costs of production.