【正确答案】 C

【答案解析】A rational number is any number that can be written as a ratio; in other words, it is a fraction. So simply determine the fraction that is exactly halfway between [*] One way to do this is to find the average, as follows:
[*]
Another way to solve this problem is to find the Lowest Common
Denominator (LCD):
[*]
The value that is halfway between [*] which is equivalent to [*].