Explanation:

The average of 4 numbers is 24, so, together, they amount to 24 x 4=96.

Let n be the first number. Then the next number is n+2; the next is n+4,

n+n+2+n+4+n+6=96

4n=84, n=21

Then the numbers are 21, 23, 25 and 27

Hence, option 1 is the correct answer.