To determine the correct answer to the question regarding Emma Stone's Oscar win at the 96th Academy Awards, let's break it down:

1. Understanding the Question:
   • The question asks which film earned Emma Stone the Oscar for Actress in a Leading Role at the 96th Academy Awards, which took place in 2024.
   • The options provided are:
     1. La La Land
     2. Poor Things
     3. The Favourite
     4. More than one of the above
2. Analyzing the Options:
   • La La Land: Emma Stone did win an Oscar for Best Actress for her role in "La La Land," but this occurred in 2017 at the 89th Academy Awards, not the 96th.
   • Poor Things: "Poor Things" is a film released in 2023, and Emma Stone's performance in this film was critically acclaimed. It is consistent with winning the award in 2024.
   • The Favourite: While Emma Stone was nominated for her role in "The Favourite," she did not win the Best Actress Oscar for this film.
   • More than one of the above: This option would only be correct if Emma Stone had won for two or more films listed, which is not the case as per the contexts provided.
3. Conclusion:
   • Based on the information and the options, the correct answer is Poor Things.
   • This was the film for which Emma Stone won the Oscar for Actress in a Leading Role at the 96th Academy Awards.