The boy thanked the Principal for granting him a fee-concession.

• A. The boy said to the Principal, I express my thanks that you have granted me a fee concession.
• B. The boy said to the Principal, I am thankful to you for a fee-concession.
• C. The boy told the Principal, You are kind enough to grant me a fee-concession.
• D. The boy said to the Principal, Thank you, madam for granting me a fee-concession.