What best describes why kamikaze pilots were willing to go on suicide missions is b. They were devoted to Japan and its emperor.
The word kamikaze means "divine wind," and makes reference to a typhoon that fortuitously dispersed a Mongol invasion fleet. In their culture, a kamikaze pilot that died in that role would win a place in heroes paradise and would be venerated for the eternity. In fact, many pilots kept a samurai sword or a picture of the Emperor with them.
