I believe it would be A. The importance of staying active
Victor assaults his investigations with excitement and, overlooking his public activity and his family far away in Geneva, gains quick ground. Later, Ardently dedicating himself to this work, he ignores everything else; family, companions, studies, and public activity, and becomes progressively pale, desolate, and fixated.
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Answer:
d) to build suspense so the reader will keep reading.
Explanation:
When an episode of a serial drama concludes with a cliffhanger, the viewer is left with unanswered questions and suspense.