You believe that oil prices will be rising more than expected and that rising prices will result

Question:

You believe that oil prices will be rising more than expected and that rising prices will result in lower earnings for industrial companies that use a lot of petroleum-related products in their operations. You also believe that the effects on this sector will be magnified because consumer demand will fall as oil prices rise. You locate an exchange-traded fund, XLB, that represents a basket of industrial companies. You don€™t want to short the ETF because you don€™t have enough margin in your account. XLB is currently trading at $23. You decide to buy a put option
(for 100 shares) with a of $24, priced at $1.20. It turns out that you are correct. At expiration, XLB is trading at $20. Calculate your profit.

Strike Price
In finance, the strike price of an option is the fixed price at which the owner of the option can buy, or sell, the underlying security or commodity.