Explanation:

- We are looking for a 3-digit number, D, such that the ratio of the number to the sum of its digits is the least possible.

- A smaller ratio indicates a higher sum of its digits in relation to the number.

- For the least ratio, consider numbers like 199 because they have large sums of digits inducing smaller ratios.

- In the number 199, the digits are 1, 9, and 9.

- The sum of the digits is 1 + 9 + 9 = 19.

- The ratio is 199 / 19.

- The hundred's place digit is 1, and the unit's place digit is 9.

- The difference is 1 - 9 = -8, hence a positive difference is 8.

- The correct option is 8.

Option:3, 8 is the correct answer.

.