Which of the following is a main characteristic of chemical reaction? 

In a chemical reaction, the reactant molecules' bonds are broken, and new bonds are then established inside the products to create a new molecule. From lighting a candle to boiling water in a glass to heating food, chemical reactions may be found all around us.

The reactions or changes in which the chemical properties of a substance change are called chemical changes. The chemical changes can be observed as a color change, a change in temperature, or the formation of products such as gases and precipitates, etc.  Most of the time, you must have noticed a chemically-induced color change in various things.
When two salts are combined, if one of the salts is solid and doesn't dissolve properly in the solution, it settles to the bottom as a precipitate. A yellow precipitate of lead iodide and potassium nitrate is created, for instance, when lead nitrate and potassium iodide react.
Because carbon dioxide, a gas, is created and escapes via the tiny holes that are created, you must feel that a cake is incredibly fluffy when you eat it.

Thus all the given options are indicative of a chemical reaction.

Hence, option D is correct.