Darwinism is a term often used when referring to a. evolution. b. socialism. c. liberalism. d. imperialism.

The correct answer is: A: Darwinism is a term often used when referring to evolution. Namely, Darwinism is a theory of biological evolution, which was developed by English scientist Charles Darwin. This theory states that all organisms arose and developed through the natural selection of of small, inherited variations that increase the individual's ability to compete, survive, and reproduce. Charles Darwin (1809-1882) was an English naturalist and geologist, and his evolutionary theory was presented in his best-known book On the Origin of Species published in 1859.