Which ingredient is commonly found in a Mojito?

In a Mojito, mint is a key ingredient that contributes significantly to the cocktail's refreshing flavor profile. The drink traditionally combines fresh mint leaves with lime juice, sugar, soda water, and rum, showcasing the mint's aromatic qualities. This herb not only adds a distinctive taste but also enhances the visual appeal of the drink through its green leaves.

The other options, such as bourbon, tequila, and whiskey, are not typically used in a traditional Mojito. Bourbon is a type of whiskey known for its rich, sweet flavor, but it does not align with the light and refreshing character of a Mojito. Tequila, a spirit distilled from the blue agave plant, is the main ingredient in drinks like Margaritas, and does not complement the mint and lime combination found in a Mojito. Whiskey offers a robust and complex flavor, which also diverges from the intended freshness of a Mojito. The use of mint is what makes the Mojito unique and is essential to its identity as a cocktail.