Correct Answer (Detailed Explanation is Below)
A.
Mercury
Detailed Explanation
Quicksilver is another name for mercury. Mercury is a chemical element with the symbol
Hg and atomic number 80. It is notable for being a metal that is liquid at ordinary room temperature. The name Hg comes from the Latin-derived term
hydrargyrum. Mercury has historically been used in thermometers, barometers and electrical devices, although its toxicity requires careful handling.