Financial derivatives contribute to market completeness because:()

A. the market with financial derivatives allows traders to more exactly shape the risk return characteristics of their portfolios. 

B. it is a market in which the owner of an option has the right to purchase the underlying good at a specific price, and this right lasts until a specific date. 

C. it is a market in which any and all identifiable payoffs can be obtained by trading the securities available in the market.