Final answer:
A man with few marketable skills and who comes from a family accustomed to minimal work would best be described as a Marginal worker, fitting the underemployment category due to an oversupply of workers.
Step-by-step explanation:
A man with few marketable skills who comes from a family in which people typically worked only enough to get by could be described using several terms. However, based on the given choices and descriptions, the most suitable term for his situation is likely Marginal worker. Marginal workers are often those who may work in undeveloped labor markets, find themselves in lower-paying jobs without benefits, and whose work may be seasonal or temporary, such as migrant farm workers, housecleaners, and day laborers.
This lack of steady, well-compensated employment aligns with the idea of underemployment, which is a state in which a person is not working to their full potential.