When It Is Said That Economic Forces Are a Key

When it is said that economic forces are a key reason for the importance and relevance of negotiation skills,what is meant by that?

A) During economic periods of high supply,low demand,negotiators cannot expect to gain much during a negotiation
B) Skilled negotiators don't need to take economic forces into account when negotiating
C) Economic pressures and forces mean that negotiators need to know how to operate in uncertain and ambiguous environments
D) The dynamic,changing nature of business means that people must renegotiate their existence in organizations throughout their careers