Teeth break down large insoluble food particles into smaller soluble molecules. Which of the following statements are correct regarding this process?
$(1)$ It is a chemical digestion process.
$(2)$ It is a physical digestion process.
$(3)$ It increases the surface area of food for enzyme action.
$(4)$ It converts complex proteins directly into amino acids.

• A
  $1$ and $2$
• B
  $2$ and $3$
• C
  $3$ and $4$
• D
  $1$ and $4$