Biology

The correct answer is: A.Point mutation

Explanation:

Looking at the sequences:

1.Original sequence: AAU UGG CCC

2.Mutated sequence: AUU UGG CCC

The only change is the first base, where A has been substituted for U. This is a substitution of one base for another, which is characteristic of a point mutation. Point mutations involve a change in a single nucleotide, without affecting the overall length or structure of the gene.