In the past, the United Stated Public Health Service and state and local health departments dominate the fields.

Question

What correction should be made to this sentence?
1) insert comma after Service
2) change state and local to State and Local
3) insert comma after departments
4) change dominate to dominated
5) no correction necessary

I think its 4, is that correct?

Answer 1

I agree.

Answer 2

I thought #2 is the correct answer.