What was the name of Darwin's book on human evolution, published in 1871?

Charles Darwin’s 1871 book on human evolution was The Descent of Man, and Selection in Relation to Sex. It is commonly shortened to The Descent of Man.

The book was Darwin’s major follow-up to On the Origin of Species, published in 1859. In it, he applied evolutionary reasoning to human beings, arguing that humans and other apes share common ancestry. Darwin did not claim that humans descended from living apes; rather, he proposed that humans and modern apes evolved from earlier shared ancestors.

The work also developed Darwin’s theory of sexual selection. He discussed how mate choice and competition could produce traits that improve reproductive success, including features that may not directly aid survival. His treatment of human evolution was controversial in Victorian Britain but became central to evolutionary biology.

The other options are genuine Darwin titles or related works, which makes them plausible distractors. The Variation of Animals and Plants under Domestication appeared in 1868, while The Expression of the Emotions in Man and Animals followed in 1872.