The phonemes which do not occur in the same linguistic environment and which when occur so, do not bring about a change in meaning are said to be in __________?

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The phonemes which do not occur in the same linguistic environment and which when occur so, do not bring about a change in meaning are said to be in __________?

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