Commas are punctuation marks that are used to separate the items in a list. Given this understanding, the correctly punctuated sentence is;
In this sentence, the comma is correctly used to separate the first adjective, "long" from the other adjective and object. Just one comma is needed in this instance to separate the two descriptions of the road.
Finally, a period is used at the end of the sentence to tell that the speaker has finished his statement. So, option B is correct.
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