Which process is a chemical change?

While some changes are non-periodic, others are periodic. Some can be undone, whilst others cannot. Therefore, on a broader scale, a change may be classified as a chemical change or a physical change depending on how a subject's attributes change as a result of the change. So let's talk about both modifications.
A substance is said to go through a physical change when solely its physical characteristics—such as color, size, shape, or appearance—alter. Furthermore, no new substance is created, and these modifications are only transient. For instance, folding a piece of paper, melting ice, or dissolving sugar in water.

A chemical change is a term used to describe when a substance's chemical characteristics change. Therefore, at the molecular level, atomic bonds either form or break. New compounds are created, and these alterations are permanent in nature. For instance, cooking, paper burning, iron rusting, etc.
From the available choices, Because a soluble salt is formed when copper (II) oxide combines with diluted acid, neutralizing copper (II) oxide requires a chemical shift. The reaction is as follows:

$\mathrm{CuO}+{\mathrm{H}}_2{\mathrm{SO}}_4\to {\mathrm{CuSO}}_4+{\mathrm{H}}_2\mathrm{O}$

Hence, the correct answer is D.