1.The _____ live next door.

Question

A) Smith's
B) Smiths
I answered B
2.Select the sentence which is correctly punctuated:
A) The diagnosis was "gastroenteritis acute."
B) The diagnosis was "gastroenteritis, acute."
C) The diagnosis was "gastroenteritis, acute".
I answered C but feel it could be B too.

Answer 1

The first is correct; the second one isn't.

Answer 2

So the quotation marks go outside of the period then?

Answer 3

So the quotation marks go outside of the period then? It's B

Answer 4

Right.