Why Would It Be Extremely Rare for Two Individuals to Share

Multiple Choice

Why would it be extremely rare for two individuals to share the same genetic profile?
1) Many base-pair substitutions are silent
2) Many base-pair substitutions occur in non-coding regions of DNA
3) Duplications and deletions of DNA sequences and other genome rearrangements contribute to the evolutionary divergence of genomes

A) 1
B) 2
C) 3
D) 1 and 3
E) All of these