Final answer:
Eliezer's lack of reaction to the crematorium is due to the desensitizing impact of the Holocaust's relentless horrors, rendering him emotionally numb.
Step-by-step explanation:
The indifference Eliezer feels towards the crematorium, as depicted in the literary work, can be attributed to the numbing effect of the horrors he has witnessed. The magnitude of the atrocities witnessed during the Holocaust could lead to a deadening of emotions as a coping mechanism. In the face of such unrelenting trauma, a crematorium becomes just another element of a brutal reality that Eliezer is forced to endure, incapable of evoking the emotional response it might under different circumstances.