Answer:
Option: d. Heinrich Gross
Explanation:
Heinrich Gross was born in Vienna and became head of the Am Spiegelgrund clinic, killed more than 700 children. The reason for the killing of the children was the master race in the Nazi Reign under its Euthanasia program. As a psychiatrist he began to study the neurology of mentally handicap children which earned him awards, later became a lecturer and served in court for insanity cases.