Geometry

Question Analysis:
This question tests the fundamental understanding of translations as a type of rigid motion.

Key Concept Explanation:
A translation moves every point of a figure the same distance in the same direction, preserving size and shape.

Step-by-Step Solution:
Option A describes a rotation.
Option B correctly defines a translation.
Option C describes a reflection.
Option D describes a dilation.

Option Analysis:
A, C, D are incorrect because they describe other transformations.