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

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

A. Allophones
B. Allomorphs
C. Minimal pairs
D. None of the above