Using your knowledge of punctuation, choose the best place to put a comma:

the long winding road was dark and ominous.

the long, winding road was dark and ominous.

the long winding road, was dark and ominous.

the long winding, road was dark and ominous.

the long winding road was dark, and ominous

A comma is used as a short pause to create meaning to the words you are saying, where you put the comma depends on what word in the sentence you wish to highlight the most 

in my opinion i would put the comma in one of two places 
The long winding road, was dark and ominous. 
The long winding road was dark, and ominous