The Expression "Survival of the Fittest" Was Coined by

The expression "survival of the fittest" was coined by

A) Darwin, to sum up the essential point of his theory about the fittest members of a society
B) Darwin, to explain how his theory about the fittest members of a society might be applied for practical purposes
C) Spencer, to reflect the notion that the fittest members of a society should suppress the less fit
D) Spencer, in an effort to discredit the essential notions of Darwin's theory