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Alfalfa is grown as a perennial crop in Oklahoma, making it the correct choice. Perennial crops are those that live for more than two years, providing a continuous yield without needing to be replanted annually. Alfalfa, specifically, is favored in Oklahoma due to its deep root system and ability to withstand drought conditions, making it an excellent forage crop that can be harvested multiple times a year.

In contrast, canola and sesame are typically grown as annual crops, meaning they need to be replanted each year. Soybean is also considered an annual crop and is primarily grown for its seeds. These differences illustrate the unique characteristics of perennial crops like alfalfa, which contribute to soil health and can reduce establishment costs over time due to their longevity.