That ratio is called"efficiency". It doesn't need to be a percent.
It can just as well be a fraction or a decimal number.
I think its d . i hope this helps
Fixed volume and shape
-Particles are locked into place
Not easily compressible
-Little free space between particles
Does not flow easy
-Particles cannot move past each other
I have the answer for A. Since there is blockage in the ear canal, some sound waves may not be able to get through or travel as quickly so you would have trouble hearing
