That's "prepositions" not "preposotions."
A and B are both correct. Remember to use on "a" Monday morning if you're referring to *any* Monday, or leave it the way it is if you are referring to a specific Monday.
19 Nisan 2014
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Hâlâ cevap bulamadın mı?
Sorularını yaz ve ana dil konuşanlar sana yardım etsin!