Final answer:
The entrepreneur among the options is 'D. a person who starts a cleaning supplies business', as they take risks and use innovation to create a new business, which aligns with the definition of entrepreneurship.
Step-by-step explanation:
An entrepreneur is an individual who takes risks and innovates to start a new business. Considering the given options, a highly-paid singer, a college teacher, or a highly-paid computer programmer do not embody the entrepreneurial spirit as much as someone starting their ventures. Therefore, the correct answer to which of the following people is an entrepreneur is D. a person who starts a cleaning supplies business. This individual illustrates entrepreneurial quality by identifying a need and taking the initiative and risk to create a business to offer new products or services to the market.