Question

Read the sentences. Then select the sentence that properly combines them by using a comma and a coordinating conjunction. We can have pizza any day. It does sound good. We can have pizza any day, but it does sound good. We can have pizza any day: but it does sound good. We can have pizza any day, it does sound good. We can have pizza any day; it does sound good.

Answer 1

It would definitely be the second sentence.
We can have pizza any day, but it does sound good. 
Whenever you are adding a coordinating conjunction, you always add a comma before the conjunction. Like: ,but or , and 

Answer 2

the second sentence is your answer