Alchemy is a branch of ancient knowledge that states that the only three essential substances in nature are salt, sulfur, and mercury. Which of these best explains whether alchemy is a science or pseudoscience?

It is pseudoscience because ancient knowledge is mystical yet reliable.
It is pseudoscience because there are at least 118 known elements in nature.
It is a science because sulfur and mercury are known to be important elements.
It is a science because salt is a commonly used compound in several laboratory experiments.