Final answer:
Based on employment sector data from developed economies, the closest estimate for the percentage of the labor force in the territorial north employed in the tertiary sector in 2019 is likely 85 percent.
Step-by-step explanation:
The subject of this question is the structure of the labor force and employment sectors in a region, which pertains to Social Studies with a focus on economics and geography. When we consider the statistical data provided about employment sectors in developed economies, such as in the United States where almost 80 percent of the workforce is employed in the tertiary sector, we can infer that in the territorial north, the percentage of the labor force employed in the tertiary sector is likely to be similar to other developed regions. Given the options provided in the question, the closest estimate to this information would be (d) 85 percent, assuming that the territory in question has a similar economic structure to that of the United States or other developed regions.