The most common number of members of a court, such as the U.S. Supreme Court, is typically A-15. However, the U.S. Supreme Court has 9 members. Since there isn't a standard answer provided in your choices, if the context is regarding a court number that is commonly cited in other jurisdictions or a theoretical court structure, please clarify.
If you're referring to a specific court system or context that might have a common number of members being 10, please specify that as well.