Answer:
Utilitarianism.
Step-by-step explanation:
Utilitarianism is the theory which is in favour of the statement i.e. "Capital punishment is morally acceptable if it prevents more people from being murdered." because Utilitarianism promotes the greatest amount of good for the large number of people. This capital punishment produce fear in the hearts of criminals and will decrease the rate of crimes in the society so that's why it is acceptable and good for our society.