The correct answer is "Elves" because it is the plural form of the word "Elf." In English, when we want to indicate more than one of something, we usually add an "s" to the end of the word. Therefore, "Elves" is the correct plural form of "Elf." The other options, such as "Elfs," "Elfes," and "Elfoes," are not grammatically correct plural forms in English.