From the description of Anne and Margot’s deaths in the passage, what can we assume typhus is?

Use the process of elimination to figure this out.
The same as starving to death cannot be the correct answer because otherwise the passage would have simply said that Anne and Margot both died of starvation. An infection the Germans gave to Anne and Poison gas used by the Germans to kill Anne cannot be correct because if the Germans had done something specifically to murder Anne, the passage would have stated that directly.