The sentence that is punctuated correctly is:
I added bread, milk, and sugar to the list of ingredients needed to make the recipe.
The other sentences have punctuation errors:
- In the second sentence, the comma after "Because" is unnecessary.
- In the third sentence, there should be a space after the ellipsis.
- The fourth sentence is also punctuated correctly, but the context may be clearer with different punctuation based on the intended meaning (though technically it is correct).
Therefore, both the first and last sentences are punctuated correctly, but the first one is a more straightforward example of correct punctuation.