In figure 1 of the illustration, fire would spread to compartment "B" by __________. Illustration SF-0013

Correct Answer: Option D — conduction

Conduction is the transfer of heat through solid materials. In the illustration, heat travels directly through the bulkhead or deck structure from compartment A to compartment B. This physical contact allows thermal energy to migrate through the steel plating, potentially igniting combustible materials on the opposite side of the barrier.