Concept:
An affine transformation is a geometric transformation used to change the position, orientation, scale, or shape of spatial data while preserving parallelism.
Step 1: Understand affine transformation.
It includes operations such as
• Translation
• Rotation
• Scaling
• Shearing
Step 2: Identify the appropriate method.
Thus,
\[
\boxed{\text{Affine transformation is used to transform spatial data geometrically}.}
\]
Therefore, the correct option is
\[
\boxed{(C).}
\]