A suspension mixture get differentiated by filtering and in the given options flour and water as a gravy is a suspension mixture.
What is suspension mixture?
Suspension mixture is a kind of heterogeneous mixture, in which solute particles are not completely dissolve in the solvent.
Metal coins and water doesn't make any mixture because coin is not dissolve in the water. Tiny water droplets present in the air forms a mist. Flour and liquid water, as in gravy forms a suspension because it makes a heterogenous mixture and having suspended particles of flour in water. And sodium chloride and water makes an ionic solution.
Hence option (C) is correct i.e. flour and water makes suspension.
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