The final consonants /s/, /z/ and /iz/ in the words ‘cats’, ‘dogs’ and ‘boxes’ are instances of ______________?

Basically Allophone is related to sound and allomorph to meaning….here s z and iz sounds are special form of allomorph bz it changed the meaning to plural and the sound of k in kill and skill is the example of Allophone bz of the same k phoneme sounds slightly different which the same k phoneme put in the category of Allophone.

is ka answer B hoga dear