"我感到很抱歉,这是他们的错误."英语怎么说?

问题描述:

"我感到很抱歉,这是他们的错误."英语怎么说?

I`m real sorry about thier blame

I'm very sorry,but it's their mistake / error.

I feel extremely sorry about that. It is their fault.

I feel terribly sorry about it. It's their mistake.