Isolated Bells Ring Clear, While Bells Crammed in a Box

Multiple Choice

Isolated bells ring clear, while bells crammed in a box have a muffled ring. If the sound of isolated bells is analogous to light from a gas discharge tube, then sound from the box crammed with bells
Is analogous to light from

A) a fluorescent lamp.
B) an incandescent lamp.
C) a laser.
D) a phosphorescent source.
E) none of these