An investigator planning to study behavioral changes during alcohol intoxication will pay subjects $600 for 6 hours of testing that includes drinking a moderate level of alcohol and completing several written questionnaires. he plans to recruit college students taking his courses, as well as economically disadvantaged and homeless people. which of the following is the most important for the investigator to address before submitting the protocol to the irb? a. potential undue influence or coercion of subjects b. method of payment to subjects c. forms of advertising for subject recruitment d. literacy of homeless subjects.