Here, you need to find a number which is greater than 1/4 and smaller than 7/8.
Now, here we can see 1/5 and 2/10 are equivalent which is smaller than 1/4 [ same numerator and bigger denominator ]
Now, 8/9 is too big among the number, so it is rejected.
The answer would be 10/20 which is equal to 0.5 and lies between them
1/4 < 10/20 < 7/8
In short, Your Answer would be Option D
Hope this helps!