<span>"Rainsford did not smile. "I am still a beast at bay," he said, in a low, hoarse voice. "Get ready, General Zaroff."</span>
did you mean main idea?
the main idea is the central, or most important, idea in a paragraph or passage.
C. is the correct answer.
C is the only answer choice that refers to the future ("a sign, he said, a sign"). The rest of the answers refer to things happening in the present in the story, with almost no reference to the future of the plot.
I believe the correct answer is: Using technical language
helps the author stress the complexity of the scientific advances and
technological achievements that Edison observed.
In this excerpt from “"Edison Marvels at the Magic of
Electricity" from the New York Tribune (October 19, 1922), author intentionally
incorporate such highly technical language to stress the complexity of the
scientific advances and technological achievements that Edison observed.
