"We have everything we need at the construction site except enough workers to complete the project." What is the correct way to revise this sentence?
a. We have everything we need at the construction site, accept enough workers to complete the project.
b. We have everything we need at the construction site accept enough workers to complete the project.
c. We have everything we need at the construction site, except enough workers to complete the project.
d. We have everything we need at the construction site, except enough workers to completed the project.