Applicability of GST on Transport Commission Agents

I have a query regarding Transportation Services.

A GTA (Say A) takes a vehicle from a Broker (Say B), who in turn takes the vehicle from Truck Owner (Say C) to supply the same vehicle to consignor/consignee. 'A' issues the consignment note in this transaction. 'B' is just an intermediary/middle man. 'B' charges 'A' say Rs. 23000/- and pays 'C' Rs. 20000/-. That is the commission earned by 'B' is Rs. 3000/-. As per my understanding the Broker 'B' is liable to charge GST as an intermediary.  Pls clarify the following query :-

1. Is there any way out to keep the Broker B out of the GST ambit ?