What are mathematical models?

A) Replications of a fire scenario that create a structure or item with a scaled-down geometric dimension and/or other variables
B) Replications of a fire scenario that create a structure or item with similar geometric dimensions and attempt to reproduce fire phenomena
C) Sets of mathematical equations that describe the behavior of a physical system
D) The use of computers to synthesize lengthy, time-dependent algorithms through a variety of software and model types

C