The diagram illustrates how $\textit{Homo sapiens}$ (modern people) may have evolved from earlier ancestors. Which of the following statements about modern people and their ancestors is correct?
- AThey are in the same species and the same genus.
- BThey are in the same species but not the same genus.
- CThey are in the same genus but not the same species.
- DThey are neither the same species nor the same genus.