Which detail from the text best supports the answer to question 1?

THESE ARE THE ONLY QUESTION OPTIONS, THERE IS NO IDK OR IDC AND THOSE WILL BE REPORTED IMMEDIATELY, ALONG WITH INCORRECT ANSWERS I WANT PEOPLE TO ANSWER CORRECTLY AND NOT FOR POINTS:

A. “It included three main camps, all of which used prisoners for forced labor. One camp also functioned as a killing center.” (Paragraph 1)

B. “In total, approximately 1.1 million Jews were deported to Auschwitz.” (Paragraph 3)

C. “Auschwitz III, also called Buna or Monowitz, was established in October 1942 to house prisoners assigned to forced labor at rubber works owned by the German conglomerate I. G. Farben.” (Paragraph 5)

D. Some were tattooed with identification numbers on their left arms.” (Paragraph 5)