We know 3 x 3 = 9. So The exact divisor of number 9.

**Explanation:**

To find the exact divisors of a number, we need to determine all the numbers that divide the given number without leaving any remainder.

The number 9 is a positive integer. Let's determine its exact divisors:

**1. Dividing by 1:**
When we divide 9 by 1, we get the quotient 9. Since there is no remainder, 1 is a divisor of 9.

**2. Dividing by 2:**
When we divide 9 by 2, we get the quotient 4 and the remainder 1. Since there is a remainder, 2 is not a divisor of 9.

**3. Dividing by 3:**
When we divide 9 by 3, we get the quotient 3 and there is no remainder. Therefore, 3 is a divisor of 9.

**4. Dividing by 4:**
When we divide 9 by 4, we get the quotient 2 and the remainder 1. Since there is a remainder, 4 is not a divisor of 9.

**5. Dividing by 5:**
When we divide 9 by 5, we get the quotient 1 and the remainder 4. Since there is a remainder, 5 is not a divisor of 9.

From the above calculations, we can conclude that the exact divisors of 9 are 1 and 3. Therefore, option 'A' (3) is the correct answer.

3×3=9