Final Answer:
The term that best describes the whole set of beliefs, attitudes, and ways of doing things of a reasonably homogeneous set of people is "culture" (option d).
Step-by-step explanation:
Culture encompasses the entirety of a group's shared beliefs, values, customs, and behaviors. It is a comprehensive term that includes the collective knowledge, traditions, art, language, and social practices of a reasonably homogeneous set of people.
While "tradition" (option a) refers to specific customs passed down through generations, "class" (option b) pertains to socio-economic distinctions, "society" (option c) is a broader term encompassing organized groups, and "ethnicity" (option e) relates to shared ancestry or heritage. "Culture" is the most inclusive and accurate term for describing the holistic aspects of a homogeneous group's way of life.
Option D is the answer.