问题如下：
A US bond portfolio manager wants to hedge a long position in a 10- year Treasury bond against a potential rise in domestic interest rates. He would most likely:
选项：
A.sell fixed- income (bond) futures.
enter a receive- fixed 10- year interest rate swap.
sell a strip of 90- day Eurodollar futures contracts.
解释：
A is correct.
The portfolio manager would most likely use a longer-dated fixed- income (bond) futures contract to hedge his interest rate risk exposure. The choice of the hedging instrument, in fact, will depend on the maturity of the bond being hedged. Interest rate futures, like 90-day Eurodollar futures, have a limited number of maturities and can be used to hedge short-term bonds. The mark-to- market value of a receive- fixed 10- year interest rate swap will become negative if interest rates rises, and thus the swap cannot be used as a hedge in this case.
选项C不理解，请问strip ...是什么意思。这个选项怎么理解
