-Thank you very much for your kind help----------- A.It's my

答案是A：
My pleasure 不用客气（用于回答别人感谢你的帮助时的用语）
With pleasure 乐意效劳 （用于回答别人请求你时的用语）
eg.---Thank you for helping me finish the work.
--- ( It's) My pleasure.
---Could you help me move the heavy box?
--- With pleasure.