If your college does not offer marketing as a major but you're interested in building a marketing career, the best option from the choices you've provided would be D. any class that teaches about decision making.
Decision-making skills are crucial in marketing, as they help in analyzing data, understanding consumer behavior, and making strategic choices about campaigns and product positioning.
Additionally, while not listed in your options, consider courses in areas such as communication, psychology, business administration, consumer behavior, market research, and digital marketing, as these can also provide valuable skills and insights relevant to a marketing career.