多謝關心 英文點講?

Depends how close you are to the person

eg, If it is your close friend you can say, " Thanks for your concern"

If it is someone you don't know very well you can say, " Thank you very much for you kind concern"

hope this helps!

thanks for you concern

Thank you for your kind concern.

The many thanks concerns or Your Kindness is highly appreciated

答案正確. 但無須如文中那樣細分. 何況 email 一般是視為 casual 的通訊.

Your Kindness is highly appreciated.