John, a Missouri resident, works for ABC's Columbia, MO branch. John discovers that the assembly line is not in compliance with OSHA regulations. John makes a complain with OSHA. John's supervisor discovers that John has made the complaint and fires John. Will John prevail in a wrongful discharge lawsuit?

A. No, because Missouri is an "Employment at Will" State

B. No, because John did not complain to his supervisor first before calling OSHA

C. Yes, because reporting violations of saftey regulations is an exception of the "Employment at Will" doctrine

D. Yes, because John was terminated without a "written warning"