Could someone help please?!

The answer is the last option because the graph goes no greater than 75 and it also goes no greater than zero but it does hit zero and 75

1. We assume, that the number 1000 is 100% - because it's the output value of the task. 
2. We assume, that x is the value we are looking for. 
3. If 1000 is 100%, so we can write it down as 1000=100%. 
4. We know, that x is 32% of the output value, so we can write it down as x=32%. 
5. Now we have two simple equations:
1) 1000=100%
2) x=32%
where left sides of both of them have the same units, and both right sides have the same units, so we can do something like that:
1000/x=100%/32%
6. Now we just have to solve the simple equation, and we will get the solution we are looking for.

7. Solution for what is 32% of 1000

1000/x=100/32
(1000/x)*x=(100/32)*x       - we multiply both sides of the equation by x
1000=3.125*x       - we divide both sides of the equation by (3.125) to get x
1000/3.125=x 
320=x 
x=320

now we have: 
32% of 1000=320