Which of the Following Statements Is True About the Ethics

Which of the following statements is true about the ethics of billing clients?

A) Social workers should inform clients that they should tip at least 15 to 20% on top of their regular fees for services
B) Social workers may charge clients whatever they would like to charge and clients may decide to accept or reject services
C) Social workers should not tell clients how much they charge for services until the very last session with them
D) Social workers should let clients know how much they charge for services and the charges should be reasonable