Are background checks required for private gun sales in Wisconsin?

In Wisconsin, background checks are not required for private gun sales. This means that individuals can buy or sell firearms to each other without the need for a background check. Option B is the correct answer because it accurately reflects the laws regarding private gun sales in Wisconsin.

Options A, C, and D are incorrect because they suggest that background checks are required either for all sales, only for handguns, or only at gun shows in Wisconsin. However, this is not the case according to Wisconsin state laws.