The correct answer is: D. Environment does not change with the passage of time, but Agent performance changes.
A semi-dynamic environment is one in which the environment itself does not change, but the agent’s performance in the environment can change
over time. This can happen for a number of reasons, such as the agent learning new strategies or the environment becoming more or less challenging.Option A is incorrect because a static environment is one in which neither the environment nor the agent’s performance changes. Option B is incorrect because the agent’s performance can change in a static environment, but the environment itself does not. Option C is incorrect because the environment is not changed in a semi-dynamic environment.