The correct answer is: B. can accelerate.
A servo controlled robot is a type of robot that uses servomechanisms to control its movement. Servomechanisms are devices that use feedback to control a system. In the case of a servo controlled robot, the feedback is used to control the position, speed, and acceleration of the robot's joints. This allows the robot to move smoothly and precisely.
Option A is incorrect because servo controlled robots can accelerate. They can also decelerate and move at a constant speed.
Option C is incorrect because servo controlled robots do not have to be hydraulically driven. They can be driven by electric motors, pneumatic motors, or other types of motors.
Option D is incorrect because servo controlled robots do not have to be electrically driven. They can be driven by hydraulic motors, pneumatic motors, or other types of motors.
Option E is incorrect because servo controlled robots are a type of robot.