Answer:
C
Explanation:
The average rate of change on an interval is simply the slope between the endpoints. 
We want to find the average rate of change of function y from x= 3 to x = 5. 
Find the endpoints. From the table, we know that the endpoints are (3, 27) and (5, 125). 
The slope between them is: 

So, the average rate of change of function y from x = 3 to x = 5 is 49. 
Our answer is C.