The threat of rejection in market transactions:

A) leads to higher prices as sellers try to cover possible losses.
B) leads to better products and lower prices for consumers.
C) leads to less cooperation between buyers and sellers.
D) does all of these.

The threat of rejection in market transactions forces sellers to offer better products and lower prices to avoid losing potential customers. This benefits consumers in terms of product quality and affordability. It does not necessarily lead to higher prices, as sellers may be aware that higher prices could also result in rejection. While there may be some instances of less cooperation between buyers and sellers, overall, the market system incentivizes cooperation and mutual benefit.