In evolutionary terms, we have more in common with:
- a Chinese school-boy
- a chimpanzee
- a spider
- a bacterium
Human beings in different parts of the world look different and have different genetic makeup.
But they can still reproduce with each other and produce fertile offspring.
Thus, due to the absence of reproductive isolation (inability to reproduce), they belong to the same species: Homo Sapiens , in spite of their differences.
So, the answer is (a) A Chinese school-boy