Answer: C) The danger of pushing the boundaries of science.
Explanation: In the given excerpt from "Frankenstein" by Mary Shelley, we can see how Dr. Frankenstein is explaining why he thinks that he did right by not creating a companion for the first creature, because he says that the monster showed malignity and selfishness, and it destroyed his friends. From the given options, the one that shows the theme that the given passage best represent is the danger of pushing the boundaries of science.