Which of the following reflects a case of bartering in social work?

The scenario described in the correct choice illustrates bartering in social work because it involves an exchange of services where one party provides a professional service in return for another service or goods instead of monetary compensation. In this case, if a social worker offers a free service and receives goods in return, it represents a mutual agreement where both parties benefit from the exchange, which is the essence of bartering.

The other scenarios do not exemplify bartering as they involve different dynamics of service exchange. Accepting a fee for services rendered reflects a straightforward transaction involving monetary compensation, rather than a barter exchange. Offering pro-bono work for clients indicates that services are provided free of charge, typically for altruistic reasons without any exchange taking place. Lastly, giving advice without compensation does not involve any exchange and instead reflects a one-sided provision of help where no goods or services are received in return.