Select the option that best completes the given sentence.
Experts believe they have found the 'first ........ evidence' for conformity to linguistic laws in non-primate species.
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"Undeniable" refers to something that is so strong or certain that it cannot be disputed.
The correct word is "undeniable," which means something that cannot be disputed or denied. The sentence should read: "Experts believe they have found the 'first undeniable' evidence for conformity to linguistic laws in non-primate species."