Final answer:
Waffle making is similar to injection moulding because in both processes a material is introduced into a pre-shaped mold to create a defined shape. The correct option is D.
Step-by-step explanation:
The process of making waffles is most similar to the manufacturing process of injection moulding. In waffle making, the batter is poured into a pre-shaped mold (the waffle iron) and then heated to cook the batter into a waffle with a specific shape and pattern.
This is analogous to injection molding, where molten material is injected into a mold to create parts with a specific design. Forging, extrusion, and casting do not involve a similar cooking or setting mechanism in a shaped cavity which is intrinsic to waffle making and injection molding.