Let us first clarify the difference between a chemical process and a physical process.
In a physical process to a modification of the chemical structure of the molecule, either by breaking or because it is coupled to another molecule.
In a chemical process, the structure at the molecular level is not affected, this can be, for example, a reduction in size at the macro level, that a substance is transported from one place to another.
Now, looking at the three options that show us, we have three physical processes.
1. The first option corresponds to a displacement of food, this is a physical process.
2. The second option is a macro level size reduction, also a physical process.
4. The fourth option is an adsorption process, this can be a physical process or a chemical process, but in this case, the molecules of a substance adhere to the walls of the intestine without changing its chemical nature, so it will be a physical process.
3. Now, the third option is the breakdown at the molecular level of the food using enzymes, this is a chemical reaction, so it is a chemical process and this will be the answer.
Answer: Food being broken down by enzymes in your stomach