The correct answer is 2199. To solve the operation manually, we add 2,175 and 24 together. When we add the units place, 5 and 4, we get 9. When we add the tens place, 7 and 2, we get 9. Finally, when we add the hundreds place, 2 and 0, we get 2. Therefore, the sum of 2,175 and 24 is 2,199.