Explanation:

- Potassium is indeed a chemical element with the symbol K. It is an alkali metal, and the symbol comes from the Latin word "kalium."

- Option 1: Na

- Na is the symbol for sodium. It is another alkali metal but distinct from potassium.

- Option 2: K

- This is the correct symbol for potassium. ??

- Option 3: S

- S is the symbol for sulfur, a non-metal used often in chemical processes and fertilizers.

- Option 4: Ca

- Ca is the symbol for calcium, which is an alkaline earth metal widely found in the Earth's crust.