Question

choose the image where a chemical reaction has not taken place.

Explanation:

Cooking eggs and browning marshmallows are chemical reactions as new substances are formed due to heat - induced changes in their molecular structure. Water waves and plant leaves are natural phenomena without chemical reactions changing their fundamental substances at a molecular level.

Answer:

The image of water waves or the image of plant leaves (assuming there are such images not fully shown in the provided partial picture but they would be the correct ones as they don't represent chemical reactions compared to cooked eggs and browned marshmallows).