The correct answer is A. Both of these works involve the danger of scientific advancement without ethics.
In The Island of Dr. Moreau, Moreau performs experiments without concern for the pain he inflicts on his subjects. To Moreau, scientific advancement is more important than ethics.
The same is true in The Invisible Man. Here, Griffin also performs experiments without concern for the ethics involved. He soon starts stealing to fund his experiments and plans to inflict a "Reign of Terror" on the country.
Both Moreau and Griffin believe their work is more important than the pain these experiments cause themselves and others. As a result, a common theme in each work is the danger of scientific advancement without ethics.
