Utilitarianism

Here’s the prompt:

According Utilitarianism’s Greatest Happiness Principle, we are morally required to do whatever action will maximize happiness overall. In 250 words  explain ONE of the objections to Utilitarianism. Do you think this objection is definitive, or can it be successfully answered? (Use the pdf on Objections to Utilitarianism and the readings as the basis of your post.)