This is true.
The reaction rates are affected by how often the particles collide.
The formula of density is mass / volume
This means that
- high mass, low volume = high density
- high mass, high volume = so-so
- low mass, high volume = low density
From the graph shown,
D has the lowest density because it has low mass yet high volume.
C is correct. Have a good day!
The best answer choice here would be 'Combination'
When air pressure is low it is Cold