The correct statement is:
Neutral mutations occur when a mutation in a DNA region results in the same sequence as the original.
Neutral mutations typically refer to changes in the DNA sequence that do not have a significant effect on the organism's fitness, meaning they neither provide an advantage nor result in harm. This can occur when the mutation does not change the amino acid sequence of a protein (i.e., it is a synonymous mutation) or is located in a non-coding region.