Option 1: This option represents a graphical variation of velocity of sound that shows a constant velocity for different absolute temperatures. However, this is not accurate because the velocity of sound is known to change with temperature.

Option 2: This option represents the correct graphical variation of velocity of sound and absolute temperature. The graph shows that as the absolute temperature increases, the velocity of sound also increases. This relationship is in accordance with the known behavior of sound.

Option 3: This option shows a decreasing trend of velocity of sound with increasing absolute temperature. This is not accurate because the velocity of sound actually increases with increasing temperature.

Option 4: This option shows a constant velocity of sound for different absolute temperatures. Similar to option 1, this is not accurate as the velocity of sound changes with temperature.

In summary, option 2 represents the correct graphical variation of velocity of sound and absolute temperature, where the velocity of sound increases as the absolute temperature increases.