Heat and temperature

A liquid thermometer is to be used to measure temperatures between
$-60\ ^\circ\text{C}$ and $50\ ^\circ\text{C}$.

Which liquid is suitable to fill the thermometer?

Liquid W: freezes at $-20\ ^\circ\text{C}$, boils at $200\ ^\circ\text{C}$

Liquid X: freezes at $-80\ ^\circ\text{C}$, boils at $90\ ^\circ\text{C}$

Liquid Y: freezes at $-120\ ^\circ\text{C}$, boils at $40\ ^\circ\text{C}$

Liquid Z: freezes at $0\ ^\circ\text{C}$, boils at $100\ ^\circ\text{C}$