The preposition ‘on’ is used to indicate a day or date. Since ‘Friday’ is one of the days in the week option C is correct. Whereas the preposition ‘at’ is used while speaking about a specific time, while ‘in’ is used to speak about a part of the day or month. Hence options A and D are incorrect. The preposition ‘for’ is a used to describe a time period. As the sentence doesn’t include a time period option B is incorrect.