The question consists of two statements; an assertion (statement of fact) and a reason (explanation for the assertion). There will be four answer choices for the possible outcomes and you have to select the correct one.

ASSERTION: When a crystal is added to a supersaturated solution of itself, the crystal does not appear to change.

REASON: The supersaturated solution is holding more solute than its normal solubility.

We are aware that a crystal, also known as a crystalline solid, is a type of solid substance in which the atoms, molecules, or ions that make up the material are organised in a highly ordered microscopic structure to form an all-pervasive crystal lattice.

Let's examine solutions that are supersaturated. It is a solution when the amount of solute dissolved exceeds what is required to create a saturated solution.
The claim is that "a crystal does not appear to change when introduced to a supersaturated solution of itself." It is untrue since a crystal will immediately begin to crystallise when it is put to a supersaturated solution of itself.
The process of crystallisation is how crystals are created. It causes a material's physical properties to change.
The supersaturated solution is keeping more solute than its typical solubility, according to the explanation in the question. It is true because crystals introduced to saturated liquids will precipitate out right away.

Hence the correct answer is C, that is, Assertion is not correct but Reason is correct