What is the essential feature of data stored by geographical information systems? OA.
The data relates to land use.
OB.
The data is linked to locations.
OC.
The data relates to geographical formations.
OD
The data is linked to a specific time.

Ifound the exercise on the internet. attached is the list mentioned above.in order for a compound to be considered optically active it can't have any axis or plan of symmetry. the molecule  shouldn't also  be superimposable on its mirror image.with such considerations, the compounds that are optically active are: -third compound on the first image is optically active; -second and third compound from the second image are optically actives.

That is true , instead try to have a sit down talk with them