The correct answer is: A. Mapping of goal sequence to an action.
An artificial intelligence (AI) agent is a computer system that can reason, learn, and act autonomously. AI agents are often used in applications such as robotics, game playing, and web search.
The function of an AI agent is to map a goal sequence to an action. This means that the agent must be able to understand the goal, and then take the necessary steps to achieve it. For example, a robot vacuum cleaner might have the goal of cleaning a room. The robot would then need to map this goal to a sequence of actions, such as moving around the room, detecting obstacles, and cleaning the floor.
The other options are incorrect because they do not accurately describe the function of an AI agent. Option B is incorrect because it does not specify that the agent must be able to understand the goal. Option C is incorrect because it does not specify that the agent must be able to take the necessary steps to achieve the goal. Option D is incorrect because it does not specify that the agent must be able to understand the environment.
In conclusion, the function of an AI agent is to map a goal sequence to an action. This means that the agent must be able to understand the goal, and then take the necessary steps to achieve it.