explain how correct answer is option number 3

Dear Student

Correct option is (C)

This Pedigree chart shows inheritance of an autosomal recessive trait (phenylketonuria).
An autosomal recessive trait may skip a generation. It may appears in case of marriage between two heterozygous individuals.
In the above chart also, trait is skipping one generation.
 Phenylketonuria is an inborn autosomal. It is a recessive metabolic a disorder in which homozygous recessive individual lacks the enzyme phenylalanine hydroxylase. 

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