Final answer:
The theme of 'be happy with what you have' is most fully addressed in the story 'The Monkey's Paw' by W.W. Jacobs, which warns against the perils of discontent and the desire for more.
Step-by-step explanation:
The theme of “be happy with what you have” is most fully addressed in the short story “The Monkey's Paw” by W.W. Jacobs. This story illustrates the consequences of being discontent with one's life and the dangers of wishing for more at the expense of appreciating present blessings. The Lottery by Shirley Jackson, although impactful, centers around the dark tradition of a sacrificial victim in a village and does not particularly address this theme. Likewise, The Tell-Tale Heart by Edgar Allan Poe deals with guilt and paranoia and Lamb to the Slaughter by Roald Dahl focuses on the cunningness of a wife who commits an unexpected crime. “The Monkey's Paw” is a clear choice as it directly confronts the idea that one should be careful what they wish for and be content with what they have.