Study the pedigree chart given below : What does it show ?

1. A. Inheritance of a recessive sex-linked disease like haemophilia
2. B. Inheritance of a sex-linked inborn error of metabolism like phenylketonuria
3. C. Inheritance of a condition like phenylketonuria as an autosomal recessive trait
4. D. The pedigree chart is wrong as this is not possible

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