Explanation
To determine the day on 25th December 2017, we can use various methods like referring to a calendar, using the Zeller's Congruence formula, or utilizing online tools.
In this case, we can use the fact that 25th December 2017 is a known date. By searching for the day corresponding to that date, we find that it falls on a Monday.
Therefore, the correct answer is C) Monday.
