The correct response is:
The constant of proportionality is 7. It takes the crew of workers 7 weeks to complete 1 road project.
In the context of the equation \(y = 7x\), the constant of proportionality (which is 7) indicates that for each road project (x), it takes the crew of workers 7 weeks to complete that individual project. Thus, if they have \(x\) projects, the total time will be \(7x\) weeks.