Answer: The moments after he first sees the Tyrannosaurus rex
Explanation:
The moment when he sees a dinosaur is showing the readers how the character's ideas and thoughts are changing in the story.
An important moment that causes his changing is a big fear, discourage and disbelief in himself. Eckel said that that situation is too much for him and he couldn't take it.
After that, Travis decided to let Eckel go home and later on, Eckel realized that his action was wrong.
It is A, concrete detail, because it is the true that Dora the Explorer is on Nickelodeon. There is concrete evidence.
