Final answer:
Solid foods are generally easier to swallow than liquid foods because mastication breaks them down into smaller particles, making them easier to swallow and digest.
Step-by-step explanation:
Solid foods are generally easier to swallow than liquid foods. Mastication, or chewing, is a crucial part of the digestive process that breaks down solid foods into smaller particles, making them easier to swallow and digest. Liquid foods, on the other hand, do not require as much chewing and can easily pass through the throat without much effort. Therefore, the answer is c) Solid.