Final Answer:
10 counties were studied throughout this research thus option D is correct,
Step-by-step explanation:
The research focused on studying 10 counties (option D). This limited number suggests a targeted and in-depth analysis, allowing for a more comprehensive understanding of specific geographical areas. The selection of 10 counties implies a deliberate and strategic approach, likely chosen for their relevance to the research objectives or the specific geographic features they represent.
In research, the choice of the number of counties studied is often driven by the scope and goals of the investigation. A smaller sample size, such as 10 counties in this case, can facilitate a more detailed examination of each region, enabling researchers to draw meaningful conclusions about the characteristics, patterns, or trends within those specific areas. This focused approach contrasts with broader studies that might cover larger geographic scopes but with less depth in each location.
By concentrating on a select number of counties, the research can provide nuanced insights into the unique attributes and challenges of each area. This method allows for a more granular analysis, enhancing the quality and depth of the findings. Ultimately, the decision to study 10 counties reflects a deliberate research strategy, balancing the need for comprehensiveness with the desire for in-depth exploration.