The correct answer is A: One. According to FCC Part 97.17, any one person may hold only one operator/primary station license grant. This is a fundamental rule of amateur radio licensing that prevents individuals from holding multiple primary licenses simultaneously. The intent of this rule is to maintain the integrity of the licensing system and ensure that each operator has a single identity in the amateur radio service. Your operator license is tied to your primary station license, and together they form one license grant. If you want to operate from multiple locations, you don't need multiple licenses - your single license allows you to operate from any location where you have permission to set up your station. The only exception is that you may hold multiple club station licenses, but you can only have one personal operator/primary station license.