Which of the Following Is a Fundamental Problem Associated with Futures

Which of the following is a fundamental problem associated with futures contracts in hedging?

A) Convenience yields affect forward or futures hedge ratios when the maturity of the future obligation hedged matches the maturity of the futures or forward contract used to hedge.
B) Large amount of cash needs to be exchanged when future contracts are initiated which will offset the hedging benefit.
C) Compared to forward contracts,there is a higher probability of default associated with futures contracts,which increases the risk of hedging.
D) Most futures contracts have relatively short maturities which do not help the long-term commitments of corporations.