End effectors are the devices at the end of a robotic arm that interact with the environment.

• A. End effectors
• B. Actuators
• C. Sensors
• D. Chassis

Answer: (A)

The main idea tested is identifying the device at the end of a robotic arm that directly interacts with the environment. This is the end effector, often thought of as the robot’s hand or tool, which performs the actual manipulation or operation on a workpiece. Examples include grippers that pick up and release objects, suction cups, welding torches, cutting tools, drills, or soldering irons. The other components have different roles: actuators provide the motion and force to move joints, sensors gather information about position, force, or contact, and the chassis is the rigid frame that supports everything. Because the statement describes the tool at the end that engages with the surroundings, it correctly identifies the end effector.