Choose the correct sentence which is built from the words and phrases given:
I / write / thank you / make a donation / our old people’s home
I write to thank that you making a donation to our old people’s home.
I am writing to say thank you to you for making a donation to our old people’s home.
I am writing so that say thank you to you for making a donation to our old people’s home.
I write to thank you to you for making a donation to our old people’s home.
I am writing to say thank you to you for making a donation to our old people’s home.