Why is our knowledge of early rome limited?

Our early knowledge of rome is limited because there really isn't much! Besides what we can see with our own eyes. I think this is mainly because, since in early rome the throne was being tossed around allot from different people to people. And as that happened allot of information and artifacts were lost.

Ibelieve it is c

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.