First, a brief overview of the etymology of the four answer options:

Magnesium takes its name from Magnesia, a district of Thessaly (Greece) where the mineral magnesia alba was first found.

Calcium comes from the Old English “cealc” meaning "chalk, soft white limestone; lime, plaster; pebble," and is connected to the Greek word “khalix" meaning “small pebble."

Lithium comes from the Greek word for stone, “lithos.” However, it could never be described as “heavy”: under standard conditions, it is the least dense metal and the least dense solid element.

Tungsten takes its name from two ordinary Swedish words, “tung” meaning “heavy” and “sten” meaning “stone.“

The “heavy stone” element lives up to its name. Tungsten is remarkable for its robustness, especially the fact that it has the highest melting point of all known elements barring carbon, melting at 3,422 °C (6,192 °F; 3,695 K). Its density is 19.25 grams per cubic centimetre (0.713 pounds per cubic inch), comparable with that of uranium and gold, and 1.7 times the density of lead.

More Info: en.wikipedia.org