The correct answer is option 4: Mercury.
Cinnabar is a red crystalline form of mercury(II) sulfide (HgS). It is the most common source mineral for extracting mercury, making it an important ore of mercury.
Option 1: Calcium is not the correct answer because cinnabar does not contain calcium.
Option 2: Copper is not the correct answer because cinnabar does not contain copper.
Option 3: Lead is not the correct answer because cinnabar does not contain lead.
Therefore, the correct answer is option 4: Mercury, as cinnabar is an ore of mercury and is composed of mercury(II) sulfide.