Convert the following direct speech into reported speech: He said, "The sun is stationary."

Explanation

Option A is correct because when reporting a general truth, the present tense is retained. Therefore, 'He said that the sun is stationary' accurately reflects the original statement. Option B incorrectly changes the tense to past, while option C omits 'that,' which is less formal but not incorrect. Option D is invalid as option A is correct.