Answer: d
Explanation: Humans can be considered agents. Sensors include eyes, ears, skin, taste buds, and so on, whereas effectors include hands, fingers, legs, and mouth. Agents are robots. Sensors on robots might include a camera, sonar, infrared, bumper, and so on. Actuators can include grippers, wheels, lights, speakers, and other components. Based on its senses, autonomous spacecraft makes decisions on its own.