Concept:Incandescent light is produced by heating a solid filament until it glows visibly.
Explanation:A tungsten filament lamp works by passing electric current through a thin tungsten wire.
The wire becomes extremely hot and emits light because of its high temperature.
This is the defining feature of an incandescent source.
Fluorescent lamps produce light through gas discharge and phosphor coating, not by heating a filament.
LED lamps produce light by electron movement in a semiconductor, not by thermal glow.
Neon lamps glow due to electric discharge through neon gas, not by incandescence.
Only the tungsten filament lamp matches the incandescent principle.
Answer:C. Tungsten filament lamp