The substitution of the aspirated /k/ for the unaspirated /k/ in the word ‘sky’ does not alter the meaning of the worD. It is an instance of ____________ ?

A. Complementary distribution
B. Contrastive distribution
C. Non__complementary distribution
D. None of the above

The substitution of the aspirated /k/ for the un__aspirated /k/ in the word ‘sky’ does not alter the meaning of the worD. It is an instance of ______________ ?