What is the next month after the December 2021 and how many days will that month have?

Here, we have to find the next month after December 2021 and how many days will that month have:

We know, that there are 12 months in a year. For every year the numbers of months and number of days remain the same. The  month and the number of days they have are as follows:

January - 31 days
February - 28 days in a common year and 29 days in leap years
March - 31 days
April - 30 days
May - 31 days
June - 30 days
July - 31 days
August - 31 days
September - 30 days
October - 31 days
November - 30 days
December - 31 days 

Therefore, the next month after December is January has 31 days.

Hence, Option A is the correct answer.