Which of the Following Changes Represents a Physical Change, Rather

Multiple Choice

Which of the following changes represents a physical change, rather than evidence of a chemical reaction?

A) When water and a yellow solution of antifreeze are mixed, the resulting solution is a lighter shade of yellow than the original antifreeze solution.
B) When concentrated HNO₃ is placed in contact with copper metal, a brown gas is formed, the copper dissolves, and a green solution is formed.
C) When an egg is fried, the clear part becomes white, and the egg becomes a solid.
D) When a piece of zinc metal is placed in a blue solution of copper sulfate, the solution turns from blue to colorless, the zinc dissolves, and copper metal is formed.
E) When solutions of AgNO₃ and NaCl are mixed, a white solid forms.