Geometry

Question Analysis:
This question asks students to identify which group of transformations all belong to the category of rigid motions.

Key Concept Explanation:
Rigid motions are transformations that preserve distance and angle measures. These include:
Translation (sliding),
Rotation (turning),
Reflection (flipping).
They do not change the size or shape of a figure.

Step-by-Step Solution:
Option B includes only rigid motions.
Dilation changes size → not rigid.
Shear distorts shape → not rigid. Thus, only option B satisfies the condition.

Option Analysis:
A: Includes dilation → not rigid.
B: Corr...