Norman Chronically Buys and Sells "Things" on EBay

Norman chronically buys and sells "things" on eBay.He is used to establishing an anchor in negotiating his way toward some endpoint,a sales price,an agreement about delivery time,shipping costs,whatever.The anchor for him is almost always a way of dealing with ________.

A) others' likely business judgments
B) knowing what the item likely sells for elsewhere
C) uncertainty
D) balancing likely costs with expected profit generation
E) frequent ups and downs in the market price