Given:
Each [tex]\dfrac{1}{4}[/tex] sheet of cake requires 0.75 teaspoon of baking soda.
To find:
The required baking soda for full sheet cake,
Solution :
We have,
[tex]\dfrac{1}{4}\text{ Sheet of cake}=0.75 \text{ teaspoon of baking soda}[/tex]
Multiply both sides by 4.
[tex]1\text{ Sheet of cake}=4\times 0.75 \text{ teaspoon of baking soda}[/tex]
[tex]1\text{ Sheet of cake}=3 \text{ teaspoon of baking soda}[/tex]
So, 3 teaspoon of baking soda is required for full cake.
Therefore, the correct option is C.