C as far as I know. Hope this helps!
Answer:
C. keeping the strands separated during replication.
I think
Explanation:
Chara 27.3 light years
Tau Ceti 11.9 light years
Zeta Leporis 70.2 light years
Epsilon Reticuli 59.5 light years
The answer is Tau Ceti.
The answer would be the last one because a deletion changes every codon configuration that follows it and thus changes the amino acid that codes for that codon
