Answer:
The correct answer to the question: Select the word, or words, that would correctly complete the following sentence: "Today´s lunch is_____ than yesterday´s", would be: Better, even better, or much better.
Step-by-step explanation:
Given the context of the sentence, and the information provided, since there is also a comparisson between two situations, or two events, and we are also talking about the quality of something, going from good, to even more, then, we would use the word better, as a comparisson, and we could also choose, if we wanted to make further emphasis, words such as "even", or "much".