Which Greek letter corresponds to the answer "Z"?

The Greek letter that corresponds to the letter "Z" is Zeta. In the Greek alphabet, Zeta is the sixth letter and it is represented by the uppercase letter Ζ and the lowercase letter ζ. This letter has a phonetic value similar to the English "Z" sound.

The other choices each represent different Greek letters: Eta is the seventh letter and corresponds to the sound "e," Iota is the ninth letter corresponding to the "i" sound, and Kappa is the tenth letter corresponding to the "k" sound. None of these letters match the phonetic or alphabetical representation of "Z," making Zeta the correct answer in this context.