How many Mondays are there in particular month of a particular year if the month ends on Wednesday?

There can be 28(February in a Non-Leap year), 29 (February in a Leap year), 30 and 31 days in a month.

For 28 days, if a month ends in a Wednesday, there are 4 days each of Monday, Tuesday, Wednesday, Thursday, Friday, Saturday and Sunday.

For 31 days, if a month ends in a Wednesday, we have 5 days each of Monday, Tuesday and Wednesday after distributing 28 days equally to the 7 days.

Therefore, if the month is not specified, we can have both 4 and 5 Mondays in a month. hence, option D.