A Common Glass Thermometer Contains a Red or Silver Liquid

A common glass thermometer contains a red or silver liquid that rises upward in a glass tube as the temperature of the thermometer increases. The liquid moves up the tube because

A) only the glass contracts as its temperature decreases, so the liquid moves up the tube to occupy more of the tube's internal space.
B) while both the glass and the liquid contract as their temperatures increase, the glass contracts more rapidly than the liquid does.
C) the pressure of gas above the liquid decreases as its temperature rises and the liquid is sucked upward in the glass tube.
D) while both the glass and the liquid expand as their temperatures increase, the liquid expands more rapidly than the glass does.