Explanation:
Option b and d would be good choices
"Strange Case of Dr Jekyll and Mr Hyde" was written by Robert Louis Stevenson and tells the story of a scientist named Dr Jekyll, a respected man in society, kind and highly valued in his field of work, where everyone recognizes him as a citizen and an exemplary professional. However, he begins to have curiosities about his second nature, one that nobody knows and that is the opposite of him. At that moment, he begins to do a series of controversial and dark experiments to reveal this second nature. These experiments use unconventional methods that address the dark side of science. The narrative presents us with the duality of human nature and the complexities between the limits of science and ethics.
Answer:
Primarily, it is done to build suspense. The author hold back information to keep the reader interested and looks forward to the rest of the unravel. Moreover, conflict is the heart of piquing a readers interest and if all was given away in the start, there would not have been much left.
However, this can not be the only case. Otherwise, the plot may resonate a pretentious aura. The author tries to look through the eyes of the characters and lets them gain information as if it were reality, being able to relate with the actual reader. Giving you, the reader, and the characters something in common; confusion.