In a Review of the Average Teacher Salaries Across School

In a review of the average teacher salaries across school districts, Ms.Godfrey found a range from $35,000 to $65,000, with teachers in urban school districts generally earning more than those in rural and suburban school districts.Ms.Godfrey has done what:

A) Made an empirical generalization
B) Constructed a theory
C) Tested a theory
D) All of the above