Which hypothesis could potentially explain the discrepancy between the mitochondrial DNA (mtDNA) and nuclear genome analysis in chimpanzees, bonobos, and gorillas?

Introgression Hypothesis: Chimpanzees and bonobos interbred with gorillas, leading to the transfer of mtDNA between these groups.

Genetic Drift Hypothesis: Random genetic mutations occurred in the mtDNA of chimpanzees and bonobos, causing greater similarity to gorillas.

Mutational Rate Hypothesis: The mtDNA of chimpanzees and bonobos experienced a higher rate of mutation, resulting in greater divergence from their nuclear DNA.

Maternal Inheritance Hypothesis: The unique inheritance patterns of mtDNA resulted in a slower rate of genetic change compared to nuclear DNA in chimpanzees, bonobos, and gorillas.