What is the role of replication in psychological studies?

(A) Replication allows psychologists to know which clients to treat.
(B) Replication increases the chances that the lay person will understand the research process.
(C) Replication provides scientifically verified approaches to treating mental illness.
(D) Replication assists psychologists in making accurate diagnosis.

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.