| Who of the following is correct? |
| Jack: There is always a cause which brings about a change in a material. |
| Cody: Most physical changes are irreversible. |
| Peter: Some changes are beneficial to us whereas some changes are harmful. |
A) Jack and Cody
B) Cody and Peter
C) Jack and Peter
D) All of them
E) None of these
Correct Answer: C
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