Final answer:
Starch is the complex carbohydrate typically tested for in foods.
Step-by-step explanation:
In the context of a Biology student, the complex carbohydrate typically tested for in foods is d. Starch.
Starch is a complex carbohydrate made by plants to store energy. It is found in many food sources like potatoes and grains. Starch is broken down into its component sugars during digestion and provides a source of energy for organisms.