What letter(s) does the letter "z" change to at the end of a plural noun?

For example: la nariz--> las nari___
(1 point)
The letter "z" changes to "s."
The letter "z" changes to "ces."
The letter "z" changes to "ies."
The letter "z" does not change in the plural.

1 answer

The letter "z" changes to "ces."