Read the sentence.Frida Kahlo, one of the most talented artists of the twentieth century, is best known for her brightly colored self-portraits.

The sentence is formal because it uses polished, standard language and gives information about Frida Kahlo’s work. It is subjective because calling her “one of the most talented artists” expresses an evaluation rather than a purely verifiable fact. The best choice is “formal, subjective.”

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