Statement — Many business offices are in buildings with two to eight floors.\nRule — If a building has more than three floors, then that building has a lift (elevator).\nQuestion — Which conclusion is necessarily true?

Introduction / Context:
We must apply a conditional rule: floors > 3 → has lift. The task is to select the logically compelled consequence, not speculative statements about coverage of floors or buildings with ≤ 3 floors.

Given Data / Assumptions:

• Domain: office buildings with 2–8 floors.
• Conditional: If a building’s floor-count > 3, then the building has a lift.
• No promises are made for 2- or 3-floor buildings.

Concept / Approach:
For any building to “have a fifth floor,” its floor-count is at least five, hence > 3. Therefore, by the rule, it must have a lift. Claims about “only above third” or “all floors reachable” exceed the given information.

Step-by-Step Solution:

Verification / Alternative check:
Any 5-, 6-, 7-, or 8-floor building must satisfy the antecedent and therefore has a lift.

Why Other Options Are Wrong:

Common Pitfalls:
Confusing “has a lift” with operational details like which floors are served.

Final Answer:
Any building that has a fifth floor necessarily has a lift.