Cointreau and Grand Marnier are both categorized as citrus liqueurs, which is why the correct choice is this option.
Cointreau is a brand of triple sec known for its clear appearance and balanced flavor of sweet and bitter orange, making it a popular choice in many cocktails. Grand Marnier combines cognac with bitter orange essence, offering a richer and more complex citrus flavor profile.
Both liqueurs are distinguished by their use of citrus fruits, which is a characteristic shared among citrus liqueurs. The other categories mentioned do not encompass these particular liqueurs, as herbal liqueurs typically involve various herbs and botanicals, spicy liqueurs incorporate spices, and berry liqueurs focus on fruit flavors primarily derived from berries. Thus, the connection between Cointreau and Grand Marnier clearly aligns with the characteristics defined in the citrus liqueurs classification.