Final answer:
The correct answer is option c. The documentarian who explored capital punishment in a film called The Abyss is Werner Herzog. He is known for his work on intense and thought-provoking documentaries, including the subject of the death penalty.
Step-by-step explanation:
The question asks about a documentarian who explored the controversial subject of capital punishment in a film titled The Abyss. Among the provided options, the correct answer is (c) Werner Herzog.
Werner Herzog is a renowned filmmaker known for his intense and thought-provoking documentaries, which often explore complex and difficult subjects. It is typical of Herzog's work to delve deep into philosophical topics such as the nature of humanity, which makes his exploration into capital punishment consistent with his oeuvre.
However, it's important to check the specific film titles from Herzog's filmography, such as Into the Abyss, which examines the human sides of crime, the criminal justice system, and capital punishment.