Final answer:
Based on economic trends and employment statistics, the greatest number of working high school students is employed in the retail sector, as it offers flexible scheduling and is part of the growing service industry.
Step-by-step explanation:
The question seeks to identify in which sector the greatest number of working high school students is employed. It presents four options: agriculture, technology, retail, and manufacturing. Looking at current economic trends and employment statistics, it is clear that the nature of work has shifted over time. While agriculture was historically a significant employer, today it is in decline, especially in developed countries where service industries dominate. Based on the provided information, jobs in services have increased dramatically in the last few decades, while agriculture and manufacturing jobs have declined.
Considering the present economic environment, jobs in the retail sector, which is part of the service industry, tend to be more accessible and suitable for high school students. Retail jobs often offer the flexible scheduling and entry-level positions that accommodate the availability and skill sets of high school students. Thus, the correct answer is: c) Retail.