He said, "If I had the key with me, I could give you the solution".

• A. e said that if he had the key with him, he could give him/her the solution.
• B. e said if he could have the key with him,he would give him/her the solution.
• C. e told that if he could have the key with him, he would give him/her the solution.
• D. e said that If he have had the key with him, he could have given him/her the solution.