Whose primary focus is sustaining and scientifically managing wildlife populations? A. Responsible market hunters
B. Private hunting clubs
C. The Environmental Protection Agency
D. Professionals in government wildlife agencies

When it comes to sustaining and managing wildlife populations, this is the primary focus of D. Professionals in government wildlife agencies.

Government wildlife agencies:

The professionals in these wildlife agencies are the ones that do the bulk of the work and so it can be said that their primary focus is to sustain and manage wildlife populations.

In conclusion, the roles described are primarily that of wildlife agencies and their professionals.

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A). Responsible market hunters

Explanation:

The key focus of the 'responsible market hunters' is to ensure scientific management and sustenance of wildlife populations. They play a direct and significant role in conserving wildlife by offering information about the amount of hunted as well as non-hunted species, endangered animals, etc. which helps the wildlife agencies to keep a check on managing the wildlife populations and prevent them from extinction and maintain biodiversity. Thus, option A is the correct answer.