If we can pick multiple it would be 5,2, or 3.
Answer:
The subject of this book is Agricultural.
Explanation:
The topics show the progression of food from growing it to cooking and eating it.
Eliezer soon discovers that the chimneys are pumping out the smoke from burning the bodies of the people that have been killed at the concentration camp. The smell coming from the chimneys is unknown at first, but soon they discover that it is the smell of burning flesh.