Solids, liquids and gases — practice question

For 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