There are 3 holes because if you do 4 thats to high cuz you would get 12 hope this is what you mean
C.
Although this is not the exact answer the circumference formula is 2(pi)r. Which is far more than the other two options.
Someone already made an answer for this
The first number would be 3×5=15.
Another number could have different values. it could be
4=2×2
12=2×2×3
20=2×2×5
60=2×2×3×5