The correct answer is: D. My brother said, “Honesty is the best policy.”
The other options are incorrect because they do not accurately reflect the sentence “My brother said that honesty is the best policy.”
Option A is incorrect because it uses a comma after the word “that.” This is not necessary in this sentence, as the word “that” is not a subordinating conjunction.
Option B is incorrect because it uses the word “told.” This word is used to indicate that someone is giving information to another person. In this sentence, the brother is not giving information to the speaker, he is simply stating his opinion.
Option C is incorrect because it uses the past tense. This is not necessary in this sentence, as the brother is not saying that honesty was the best policy in the past, he is saying that it is the best policy now.
Therefore, the correct answer is: D. My brother said, “Honesty is the best policy.”