The correct answer cannot be any of the other choices besides, sequence.
If the answer was "Adding an Idea" it would have to be furthermore, yet, in addition, and other choices.
The only category "Afterword" belongs in is a sequence.
The apathy which seemed to take possession of some of the men at the frustration of their hopes was soon dispelled
When they were about a mile and a half away their voices were quite audible to us at Ocean Camp, so still was the air.
In the article, the author - Neil de Grasse Tyson discusses parapsychology and writes that comparing it with real science is absurd because there is no way to support the sixth sense in humans. He notes that our senses are limited and scientific knowledge is needed to prove the theories. The correct answer is D.