GMAT Critical Reasoning (CR) | Re: Loggerhead Turtles. (CR: Weaken)

Premis: Ninety-five percent of the DNA samples taken from the Baja turtles match those taken from turtles at the Japanese nesting sites.

Conclusion: juvenile Pacific loggerheads that feed near the Baja peninsula hatch in Japanese waters 10,000 kilometers away.

Assumption: 95% of the DNA Sample match indicates that the Baja turtles and Turtles at Japanese nesting sites are the same.

Which one of the following, if true, most seriously weakens the reasoning above?

(A) Nesting sites of loggerhead
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