Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
|  | verb; action |  | type of change (physical change, chemical change) |
| --- | --- | --- | --- |
| When something | rusts | it undergoes a | chemical change |
| When something | burns | it undergoes a | chemical change |
| When something | cooks | it undergoes a | chemical change |
| When something | sours | it undergoes a | chemical change |
| When something | magnetizes | it undergoes a | physical change |
| When something | boils | it undergoes a | physical change |
| When something | dissolves | it undergoes a | physical change |
| When something | is diced | it undergoes a | physical change |
| When something | is cut | it undergoes a | physical change |
| When something | is chopped | it undergoes a | physical change |
| When something | combusts | it undergoes a | chemical change |
| When something | is digested | it undergoes a | chemical change |
| When something | is baked | it undergoes a | chemical change |
| When something | explodes | it undergoes a | chemical change |
| When something | rots | it undergoes a | chemical change |
| When something | is grilled | it undergoes a | chemical change |
| When something | is crushed | it undergoes a | physical change |
| When something | melts | it undergoes a | physical change |
| When something | is mixed | it undergoes a | physical change |
| When something | breaks | it undergoes a | physical change |
| When something | is shredded | it undergoes a | physical change |
| When something | is submlimated | it undergoes a | physical change |
| When something | stretches | it undergoes a | physical change |
Question:
When something sours it undergoes a _______ change. Select the correct choice to answer the question or fill in the blank.
Choices:
(A) physical
(B) chemical
(C) emotional
(D) psychological
Answer:
(B) chemical