I really appreciate ____ to help me,but I am sure that I wil

I really appreciate ____ to help me,but I am sure that I will be able to manage it by myself.
A you to offer B your offering C that you offer D that you are offering 请分别解释下其他选项 我选的是C 为什么不对
我选C appreciate that you offer to help me 你主动提出帮助我 为什么不对？