That seems to be the way I look at the answers also. I do love the phone number question and their reasoning. LOL!
If I had a land line, I still wouldn't give that out. And they ain't gonna get our cell numbers for sure.
They can go scratch. The census is intended as an enumeration by the Constitution. Only question #1 is thereby reasonable. And only question #1 is needed for districting purposes.
This is no a very well thought out question, IMO. There are many multiple dwelling units in major cities that don't qualify as either houses or apartments. To the uninformed, apartment will mean 'rental unit' whereas they may be living in a condo unit, which certainly isn't a house, or rental unit per se. I would think it would be rather confusing for some.