Final answer:
The most effective research question for Cameron’s study is 'How can better access to natural areas improve the health of people in Benton Harbor?' as it directly ties the increased access to beneficial outcomes for the community's health.
Therefore, option b is correct.
Step-by-step explanation:
The most effective research question based on Cameron’s goal of increasing access to nature in his community is B. How can better access to natural areas improve the health of people in Benton Harbor? This question is directly related to the broader topic of environmental justice and assesses the potential social change that improved access to natural areas can have on the community's health. It is specific to the Benton Harbor community and seeks a consequential understanding of the relationship between nature access and health, which is central to multidisciplinary approaches involving public health, ecology, and urban planning. It prompts exploration of both the issue at hand and invites solutions that could be derived from improvements to access, therefore addressing Cameron's original goal.