Answer: D
Explanation: The difference between a concentration camp and an extermination camp is that concentration camps were primarily used for forced labor and imprisonment, while extermination camps were specifically designed for the mass murder of prisoners.
Concentration camps were initially established by the Nazi regime as a means of imprisoning political dissidents, social outcasts, and other groups deemed undesirable by the government. Prisoners in concentration camps were subjected to forced labor, inadequate food and medical care, and harsh living conditions, with the aim of breaking their spirits and exploiting their labor for the benefit of the Nazi war effort.
Extermination camps, on the other hand, were specifically designed for the systematic murder of Jews, Roma, and other groups targeted for extermination by the Nazi regime. These camps, also known as death camps, were equipped with gas chambers and other killing facilities, and were responsible for the deaths of millions of people during the Holocaust.
Therefore, option D - concentration camps were slave-labor prisons and extermination camps were for mass murder - is the most accurate answer to the given question.