What is 8/9 closer to? a. 1/2 b. 1 or c. 0

9/9 = 1 and 8/9 is only 1/9 less than 9/9 which is 1.

B) 1  8/9 is closer to 1

In order to find this out, you could convert all the numbers to have the same common denominator. If you made the denominator 18, then
8/9 = 16/18
1/2 = 9/18
1 = 18/18
0 = 0/18.

This allows a clear comparison which shows that 8/9 is closest to 1 out of those options as it is only 2/18 (or 1/9) different. Therefore, the answer is B.