Explanation:

- Prime numbers between 9 and 22 are: 11, 13, 17, and 19.

- To find the average, sum these prime numbers: 11 + 13 + 17 + 19 = 60.

- Divide the total sum by the number of prime numbers, which is 4.

- The average is 60 / 4 = 15.

- Option 1: 14 is incorrect as the calculated average is not 14.

- Option 2: 15 is correct. It matches the calculated average.

- Option 3: 10 is too low when compared to the calculated average.

- Option 4: 12 is also incorrect and lower than the calculated average.

The correct Answer is Option 2: 15.