Arrange the following steps in the correct sequence of innate immune response activation: A) Natural killer cells target infected or cancerous cells, B) Inflammation occurs in response to infection, C) Fever develops to create an inhospitable environment for pathogens, D) Pathogens multiply without causing symptoms.

First, pathogens multiply quietly inside the body without causing symptoms (D). This unchecked growth triggers the body's first warning: inflammation (B). The inflammation signals the body to raise its temperature, creating fever that hinders further pathogen growth (C). Finally, natural killer cells recognize and destroy the infected or cancerous cells that have arisen (A). This progression shows how the innate immune system detects, responds, and fights infection.