Step-by-step explanation:
The answer is
If naya is 4 years old then 3 times Adam age is 12
After 4 years naya is 8 years old and Adam is 16
We can check it because twice of 8 is 16
So now Adam is 12 years and Naya is 4 years old
The answer you selected in that photo given, is correct. I can tell just by using common sense and by judging the other options second option (B) is looking the most clearest one to me.
Yes it is a digit because you can go from 0, 1, 2, 3, 4 and so on
