Solids, liquids and gases — practice question

During which changes do the particles become more widely spaced? $ \text{gas} \;\xrightleftharpoons[\;Y\;]{\;W\;}\; \text{liquid} \;\xrightleftharpoons[\;Z\;]{\;X\;}\; \text{solid} $

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