A. The constant of proportionality is 7. It takes the crew of workers 7 days to complete 1 road project.
B. The constant of proportionality is 7. It takes the crew of workers 7 days to complete all of their road projects.
C. The constant of proportionality is 7. It takes the crew of workers 7 weeks to complete 1 road project.
D. The constant of proportionality is 7. It takes the crew of workers 7 weeks to complete all of their road projects.