Answer: A) few survived the horrific train ride.
The excerpt does not show that his father and him were safe. Difficulties could have been waiting for them right after leaving the train. Moreover, there is no blame attached to Meir Katz for remaining on the train. He was just a victim of horrific circumstances. There was also no purpose in leaving him behind according to this passage. However, the passage does prove that very few people survived the train ride (in this case, 12/100).