Concept:Water is unsuitable for use as a thermometric liquid due to several physical properties that affect accuracy and visibility.Explanation:Water wets glass, so it climbs the walls of the thermometer tube and forms a curved meniscus.This makes the level difficult to read accurately.Water is colourless, so it must be coloured with a dye to be seen clearly in the tube.Water has a relatively low density, which can make the thermometer less sensitive and more easily affected by pressure changes.These are all valid reasons why water is not suitable.Answer:C. I, II, and III only