Answer:
Jan.
Explanation:
Using process of elimination, your answer would be Jan. Let me explain. Feb does not have any proper ending to the abbreviation, such as a symbol. For this reason, we can eliminate it along with Septem. For october, the proper abbreviation would be oct, eliminating the excess o. For this reason, we end up with the proper answer, Jan. Hope this helped, please let me know if you have any further questions. :))
