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　　How to create a bull spread ？
　　A.Buy a put with a strike price of X= 55, and sell a put with a strike price of 50.
　　B.Buy  a put with a strike price of X = 50, and sell a put with a strike price of 55.
　　C.Buy a call with a premium of 5, and sell a call with a premium of 7
　　D.Buy a call with a strike price of X = 50, and sell a put with a strike price of 55.
　　Answer: B
　　A bull spread involves buying a put with a low strike price and selling another put with a high strike price or buying a call with a low strike price and selling another call with a high strike price.