You Are Writing a Research Paper on the Hydrological Impacts

You are writing a research paper on the hydrological impacts of hydraulic fracturing, or fracking, on groundwater in your state. In your research, you have found that a professor at a university in another state, Dr. Thomas Henry Wright, has conducted similar research. You decide to write an inquiry letter to ask him some questions. Which salutation is most appropriate for your letter?

A) Dear Tom:
B) Dear Thomas Henry Wright:
C) Dear Dr. Wright:
D) Dear Professor: