Explanation:

- The statement says the manager gives "instantaneous" replies, which means the responses are given without any delay.

- Option 1: Immediate - This option aligns with "instantaneous" because both imply quick and prompt action.

- Option 2: Delayed - This suggests a postponement in response, which is opposite of "instantaneous."

- Option 3: Deliberate - This implies a careful and thought-out process, not quick or instantaneous.

- Option 4: Unwanted - This means unnecessary or not desired, unrelated to the speed of replies.