A crystalline solid is heated at a steady rate, and the graph below shows how the temperature changes with time. Which statement about the particles in the material is correct?
- AIn the time from P to Q, the particles are arranged randomly.
- BIn the time from Q to R, some particles are arranged regularly and some particles are arranged randomly.
- CIn the time from R to S, the particles are widely spaced.
- DThe arrangement of the particles is the same in the time from P to S.