What does genomic analysis show about the ancestors of modern humans, Neandertals, and Denisovans?

A) that the ancestors of modern humans interbred with Denisovans but not with Neandertals
B) that Neandertals interbred with Denisovans
C) that the ancestors of modern humans interbred with Neandertals but not with Denisovans
D) that the ancestors of modern humans interbred with both Neandertals and Denisovans