Sulfur is a yellowish solid element (this is important to know)
to determine the element most like sulfur on the periodic table, you look at the elements next to sulfur, which would be Oxygen, Phosphorus, Chlorine, and Selenium
now, elemental oxygen and chlorine both come in the form of gases, which is denoted by the "white" letter (Hg - mercury comes in the form of a liquid fyi)
so Oxygen and Chlorine are not the correct answer since a gas is different from a solid
Calcium is nowhere near Sulfur, so through process of elimination, the best answer would be Phosphorus