Answer: B. wrist
Answer: The robot's hand is mounted on the robot's wrist and directly grasps the parts that work or perform the job.
In industrial robots, the hand is the actuator of the robot to carry out specific work. It is usually mounted on the wrist of the robot and can grasp work or perform jobs by rotating , panning, zooming and other forms of movement.
The robot's hand can be designed according to different application needs, such as grippers, welding torches, sprayers, etc., to meet the requirements of various jobs.
Therefore, the answer to this question is B.