Uhh I think d sorry if wrong ;-;
Sound waves travel faster in denser materials and the more dense the material the faster the sound is
The answer to fill in the blank would be B) because say for ex you are sick and your mom checks your temperature, she is doing this to see how hot/cold are you, so she is checking your body to see how you are, so same with this, temperature basically measures the kinetic energy/motion of particles in something.
