An investigator planning to study behavioral changes during alcohol intoxication will pay subjects $600 for six hours of testing that includes drinking a moderate level of alcohol and completing several written questionnaires. He plans to recruit people age 21 years and older (college students taking his course and people that are homeless in the local area). Which of the following is the most important issue to address before submitting the protocol it the IRB? A. Method of payment to subjects that are homeless

B. Potential undue influence or coercion of subjects

C. Forms of advertising for subject recruitment

D. Literacy of homeless subjects