In a Desperate Bid to See the Negotiation Through,a Manager

In a desperate bid to see the negotiation through,a manager concedes to all of the demands and requests of the other party.However,there is nothing asked for on a quid pro quo basis.He deems the negotiation a success,having finally clinched the deal.What negotiation myth has the manager succumbed to?

A) negotiators need to be trusting of the other party
B) negotiators just need to get the deal through, irrespective of other factors
C) negotiators need to be either tough or soft
D) negotiators need to work independently to make the process a success