Alchemists were the first ones to learn the process of isolating ……….. and ……………
Silver ,Gold
The explanation for correct option D:
Alchemists were able to transmute base metals into gold, Silver.
The best-known goals of the alchemists were the transmutation of common metals into gold (called chrysophobia) or silver.
The explanation for incorrect option A Zinc and calcium: These metals are not noble and alchemists don't work with these elements.
The explanation for incorrect Option-B Phosphorus and Zinc: Cant be transformed into the Nobel medals.
The explanation for incorrect Option-C Phosphorus and Calcium: Alchemy aims for the transmutation of base metals into Nobel one but Phosphorus and calcium don't have the properties to become gold.
Concluding Statement: For the Above reasons, option D is the correct answer.