Explanation:
Change into passive....
They are inviting us on our holiday ...
The structure used in this sentence...
- Sub + is / am / are + being v3 + Obj....
Ans : We are being invited by them on our holiday...

Hmmm. i think it is D. but thats just my opinion <span />
canoniz'd bones", "hearsed in death", and "ponderous and marble jaws"