You need to make a clear distinction:)
The answer is A.
It can't be B because it's not an imaginary tale since it's about her childhood. Not a long and interesting joke because it's about her childhood, and not a joke. And not D because it's not factual.
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.
The answer to this question is a metaphor