was the Nazis' program of involuntary "euthanasia," wherein over 70,000 mentally and physically disabled patients were murdered at extermination centers in psychiatric hospitals. A. Unit 731 B. The Tuskegee Experiment C. the T-4 program D. the Belmont program

C. the T-4 program

Explanation:

T-4 program was a program undertaken by the Nazis where subjects died of involuntary euthanasia.

Euthanasia is the act of taking a life as a relief to suffering.

T-4 stands for Tiergartenstraße 4 the street address where the personnel involved in the program were recruited.

Patients that were incurable were selected by the doctors and given a mercy death (euthanasia).

275,000 to 300,000 people were killed between 1939 to 1945

tbh idk same thing here

c. taught scientists many new things about the earth, but not other planets.

explanation: