Choose the correct answer. You look ... today.

The correct answer is "beautiful". Explanation: In this sentence, "look" is a linking verb. Linking verbs connect the subject of a sentence to a noun or adjective that describes or renames the subject. After a linking verb, we typically use an adjective, not an adverb. * "beautiful" is an adjective. * "beautifully" is an adverb. * "more beautiful" and "the most beautiful" are comparative and superlative forms, which aren't grammatically appropriate without additional context or comparison. Therefore, the correct sentence is: "You look beautiful today."