Among the options provided, a miner would most likely be able to begin work after receiving a high school degree and completing an on-the-job apprenticeship. Many positions in mining require specific training and safety certifications, but they often do not require a college degree, making it feasible for someone with a high school education and apprenticeship experience to start working in that field.
The other options, such as a forester, conservationist, or park worker, typically may require additional education or training beyond high school, as these roles often involve more specialized knowledge in forestry management, ecology, or environmental science.