The correct option is A Incomprehensible realities
In line 53, the author says that the adults had made an attempt to divert the children's attention with the planetarium and distract them from potato chips and scanned goods by making them concentrate on the information that the planetarium provided. The author then goes on to say that this trick of the adults is not successful. He uses the term "horrible immensities" with reference to the information provided by the planetarium and probably indicates the incomprehensible realities of the universe that the mentioned information is made up of. Thus E is the best answer.