In the graph, a sample of water is heated from 40 degrees Celsius to 100 degrees Celsius. Which statement correctly describes the curve?
A) QR - liquid only
RS - phase change liquid-gas
ST - gas only
B) QR - liquid only
RS - phase change liquid-solid
ST - solid only
C) QR - solid only
RS - phase change solid-liquid
ST - liquid only
D) QR - phase change solid-liquid
RS - liquid only
ST - phase change liquid-gas
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