Here's a problem to solve: Pat dissolves some table salt in water. She then puts a drop of the water on a microscope slide and turns on the lamp. As the water evaporates, Pat observes small cubic structures being formed. What process is Pat seeing through the microscope?

Among the 4 following options, which is the correct answer?

- A: purification of an ore
 
- B: the growth of a crystal
 
- C: a liquid becoming a solid
 
- D: sedimentation of granules
 