Coal.
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Coal is a solid fossil fuel that begins with the letter "c". It is a natural resource formed from the remains of plants and trees that lived millions of years ago. Coal is used for electricity generation and in various industrial processes.
Oil, also known as petroleum, is a fossil fuel that is obtained by drilling. It is a liquid form of fossil fuel that is used for various purposes such as transportation, electricity generation, and the production of plastics and chemicals.
Sulfur undergoes a phase change from solid to liquid as the temperature increases from 20°C to 100°C. This is because sulfur has a melting point of around 115°C, so it transitions from a solid state at 20°C to a liquid state at 100°C.
Presumably, phoshophorus at room temperature, would be at ... room temperature. It would be solid and melt at 44.2°C (white phosphorus: 111.56°F) or 610°C (black phosphorus: 1130°F)
It is a solid that can be liquefied In order to retrieve it to the solid form you need to allow the liquid to evaporate. It will leave the solid form. It is salt when chlorine is added, creating sodium chloride.
Sulfur is a solid at room temperature and pressure. It melts at 115.21°C (239.38°F) and boils at 444.6°C (832.3°F).