The correct answer is: B. controller
A controller is a device that controls a machine or system. It receives input from sensors and uses that input to control the output of the machine or system. In a robot, the controller is responsible for controlling the movement of the robot’s arms and legs, as well as its sensors and other components.
A sensor is a device that detects changes in its environment and sends signals to the controller. Sensors can be used to detect things like temperature, pressure, light, and sound.
An arm is a mechanical device that is used to move objects. In a robot, the arm is typically attached to the body of the robot and is used to pick up and move objects.
An end effector is the part of a robot that comes into contact with the environment. In a robot, the end effector is typically used to grip objects.
Here is a diagram of a simple robot that illustrates the different parts:
The controller is the box in the middle of the robot. The sensors are the small devices on the arms and legs of the robot. The arm is the long, thin piece that extends from the body of the robot. The end effector is the small, round object at the end of the arm.
I hope this helps!