Final answer:
In the context of physics and rotational motion, the rotational analog of linear distance is the rotational angle. It is measured in radians or degrees and indicates the extent of rotation about an axis.
Step-by-step explanation:
The question 'What is the rotational analog of distance?' pertains to the concept of rotational motion in physics. The correct answer is a. Rotational angle. Analogous to how distance measures the extent to which an object has moved in a straight line, rotational angle measures the extent of an object's rotation about an axis. It's the angular equivalent of linear distance and is often measured in radians or degrees. While torque is analogous to force, angular velocity is the rotational equivalent of linear velocity, and angular momentum is akin to linear momentum, these are not analogs of distance in a rotational sense.