Hooterville's Chamber of Commerce Has Been Successful in Its Campaign

Hooterville's Chamber of Commerce has been successful in its campaign to attractmanufacturing firms ("Locate here, we give a hoot!") and the community has experienced an increased average wage rate. Why?

A) The new firms like residents of Hooterville.
B) Labor costs more in other communities.
C) Hooterville has a nice train station.
D) The supply of labor has changed.
E) The demand for labor has changed.