Answer:
B
Step-by-step explanation:
The best - well, only way- is to check a few points.
Namely -1 (unless your eyesight is really poor!), 0, 1, 2, and 3.

Now you can mark all these points in each graph (well, you could if they were on paper and not on a screen) and see which one of the lines passes through all of them. Spoiler alert, it's the B graph.
A represents
, B is the one you want, C is
and D looks like 
I am thinking it would be 6
Answer:
just 4 words only
Step-by-step explanation:
in order to maintain the rules
You didn't post any basic information for me to work on the answer.
every cylinder has a different radius and a different hight and hit at different points on the map you need to give basic information
cost/ x
radius
hight
...
a lot of missing information here