Step 1: Distinguish structures from levels.
In Freud, the {dynamic agencies} that drive behaviour are the id, ego, and superego (structural model).
Step 2: Identify the out–of–set item.
The unconscious belongs to the {topographical model} (conscious / preconscious / unconscious). It is a {level of mind}, not a dynamic agency.
Step 3: Conclude.
\[
\boxed{\text{Unconscious (Option A).}}
\]