Answer:
Option D is answer.
Explanation:
Step 1 we find the Highest common factor of the numerator 
which is obtained by taking minimum exponent of each term 
since 48 and 72 both are divided by 24 and we get 2 and 3 after taking 24 common 
and since its x which is common in both 
highest common factor for y is 
 ,we have
 ,we have 
 , and 1
 , and 1 
so altogether we can take 
 we have expression as
 we have expression as 
 
 
on simplifying it ,we get 
2(2y-3) which can be written as 2y-6 after distributing 2 inside.