Final answer:
The type of transformation for x² is Dilation.
Step-by-step explanation:
The type of transformation for x² is d) Dilation.
A dilation is a transformation that changes the size of an object while maintaining its shape. In the case of x², as the value of x increases, the value of x² also increases. This means that x² grows proportional to the length squared, which is a characteristic of dilation.