Final answer:
The two men wearing coveralls and smoking cigarettes are likely to be engaged in manual labor, such as working on cars, as coveralls are often associated with mechanical work.
Step-by-step explanation:
Based on the context provided, the two men wearing coveralls and smoking cigarettes are most likely engaged in manual labor, potentially working on cars. Coveralls are a type of protective clothing commonly worn by mechanics, suggesting that they might be auto workers or involved in some form of mechanical work. Additionally, smoking cigarettes fits within the historical context of activities that laborers might be engaged in during breaks or while working.