The correct answer is C The east end of the national mall, just passed the reflecting pool.
Absolute locations are information given without using a reference point, and it doesn't change over time.
Good examples of absolute locations are:
- GPS coordinates (like answer A)
- A street address (like answer B)
- A unique landmark (like answer D)
Answer C is giving a relative location information, which is not always reliable, because it can change from person to person or over time (the reflecting pool might not be there in the future for example)