)select the correctly punctuated sentence.
school began on a cold september morning.
school began on a cold, september morning.
school began on a cold september, morning.
school began on a cold, september, morning.

I'd say that the correct answer is the first one, 'School began on a cold September morning' because it seems the most natural. The last two examples are certainly incorrect, because the comma is placed in the wrong spot. But I am not sure about the second example, although I do think the first one is correct. 

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