The correct answer is option 4, Alzheimer`s Disease.

To understand why it is the correct answer, we need to understand what a dominant autosomal disorder is. Dominant autosomal disorders are genetic disorders that are caused by a mutation in a single gene on one of the autosomes (non-sex chromosomes).

Option 1, Albinism, is not a dominant autosomal disorder; it is a recessive autosomal disorder. This means that for a person to have albinism, they must inherit two copies of the mutated gene, one from each parent.

Option 2, Cystic Fibrosis, is also a recessive autosomal disorder. Like albinism, it requires the inheritance of two copies of the mutated gene.

Option 3, Phenyl Ketorunia, is also a recessive autosomal disorder. It follows the same inheritance pattern as albinism and cystic fibrosis.

Therefore, the correct answer is option 4, Alzheimer`s Disease, as it is the only disorder listed that is caused by a dominant autosomal genetic mutation.