Solids, liquids and gases — practice question

For which changes do the particles become more widely spaced? $\text{gas} \; \overset{W}{\underset{Y}{\rightleftharpoons}} \; \text{liquid} \; \overset{X}{\underset{Z}{\rightleftharpoons}} \; \text{solid}$

• AW and X
• BW and Z
• CX and Y
• DY and Z