Joseph discovered that if he lit a candle in a jar with a plant it would extinguish. But if he left it for a few weeks it would relight. What is the significance of this?

explanation:

i think option no d is the correct answer

alchemy hadn't scientific methods of study, appeal to mysticism and fantasy, the knowledge of chemistry and physics were modest at that time.

alchemy was - but as new rules were discovered it either changed into chemistry or it became "unscientific".