The correct option is
A Chocolate factory
To find the starting place, try moving to you right from the airport and also from the chocolate factory.
If the starting place is the airport,
then after moving 9 units to the right , you will reach (4, 5). Then, moving 6 units upward, you will reach (4, 10). But, the stadium is at (5, 3).
If the starting place is the chocolate factory, after moving 9 units to the right, you will reach (5, 3). Then, moving 6 units upward, we will reach (5, 3).
The stadium is at the same coordinates(5, 3).
Hence, the chocolate factory is your starting place.