Choice 4 is incorrect. The angles aren’t similar nor congruent.
The simple and easiest way to find it is that you add all the numbers of that value i.e.: 1485=1+4+8+5 it will give u a number which will tell u if it is divisible by what number i mean that: 1+4+8+5=18 so 18 is divisible by 2, 3, 6, and 9
The lowest possible denominator of 1/8 is 1/8.
1/8 can't be simplified anymore making this the smallest possible denominator.