Answer:
Hence, the average rate of change is:
1.5
Step-by-step explanation:
We have to find the closest value to the average rate of change from x=3 to x=5.
We know that the average rate of change of a function f(x) from x=a to x=b is calculated as:

i.e. here we have:
a=3 and b=5
Now,, from the graph of the function f(x) we could observe that:
and 
Hence, the average rate of change from x=3 to x=5 is:

Hence, the average rate of change is:
1.5