Q:

Select the most appropriate direct form of the given sentence.

He regretted the mistake he had made in his calculations.

• 1
  He said, “I regretted the mistake I made in my calculations.”
• 2
  He said, “I am sorry for the mistake I made in his calculations.”
• 3
  He said, “He regrets the mistake he made in my calculations.”
• 4
  He said, “I regret the mistake I made in my calculations.”