We have to consider that almost all animals reproduce sexually, being a few able to reproduce both ways. Among the answer options, a spider, a lobster, a human, reproduce sexually, although their somatic cells reproduce asexually by mitosis, their sexual cells, such as sperm and ovules, reproduce sexually by meiosis.
Bacteria, instead, can only reproduce themselves by mitosis or binary fision, so the only reproduce asexually. The correct answer then is D. bacteria.