The correct option is A 2600
Given number is 2624
2624 lies between 2600 and 2700.
The number formed by last two digits of 2624 is 24.
If the number formed by last two digits is less than 50, then we round off the given number to the nearest multiple of 100 which is smaller than the given number.
∵ 24 < 50
∴ 2624 will be rounded off as 2600.