Answer: The graph with the highest density of air.
Explanation: The graphs are missing, but il try to explain this problem anyways.
Soundwaves are mechanical waves, that need a medium to move (commonly, the medium is the air)
As those mechanical waves affect the air, the density of air in some areas increase and in others decrease, and when that "wave of air" impacts a receptor, like your ear, you receive the information of the sound, like pitch and intensity.
As more air impacts the receptor, more "loud" is the noise, and as you may know, density = mass/volume, so as biggest is the density of air in a point, this means that we have more mass of air at that point, which is directly related to the intensity or loudness of the sound wave at that point
