Explanation:

We now need to obtain the digital root of the number. Here's how you do it:

Split the number up and add each digit together:

6 + 6 + 0 + 4 + 9 = 25

If the answer is more than one digit, you would add each digit of the answer together again:

2 + 5 = 7.

Hence, option 2 is the correct answer.