Which sentence is punctuated correctly

C.

Explanation:

That is the only sentence that has the commas in the right spots. Sometimes it helps to read the sentence aloud, and where ever you pause is where a comma should be.

(hope this helps!)

are you kidding? from that description of two mansions, you can't figure out which one is bleak and desolate? maybe you should consider looking those words up in a dictionary, if you don't know what they mean already.