Final answer:
In the syringe demonstration, when the plunger is pushed down, the marshmallows shrink due to water loss.
Step-by-step explanation:
In the syringe demonstration, when the plunger is pushed down, the marshmallows shrink due to water loss.
As the plunger is pushed, pressure is generated inside the syringe, causing water to be expelled from the marshmallows. This loss of water causes the marshmallows to shrink in size.
Therefore, option b) They shrink due to water loss is the correct answer.