Final answer:
John is buying copy paper for his printer for his home-based business, which suggests that he is a business owner. This is the most logical choice out of the given options, as the other professions do not directly relate to the context of buying paper for a business. Option 4.
Step-by-step explanation:
John is buying copy paper for his printer that he uses in his home-based business. Based on the provided information, John is a business owner(4). When we consider the options provided - a student, a teacher, a doctor, and a business owner - the most logical choice is that John is a business owner because the context describes him as someone who uses the printer for his home-based business. Assuming personal use is not the primary intention for buying the paper, being a business owner concerns the direct needs of his business operations, such as printing documents for work purposes.