Which of the Following Scenarios Provides the Best Description of a "Multiple

Which of the following scenarios provides the best description of a "multiple relationship?"

A) A psychologist agrees to provide therapy to his best friend's son.
B) A psychologist works as both a therapist and a researcher at a university.
C) A therapist works a full-time job on weekdays and also sees clients on weekends and evenings.
D) A psychologist pays an advertising agency to produce brochures for her new clinic