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(c) Temperature 

Temperature is measured directly in a coffee-cup calorimeter.

See Attached Image. Figure shows Coffee-cup calorimeter. This simple apparatus is used to measure temperature changes of reactions at constant pressure.

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(c) Temperature is measured directly in a coffee-cup calorimeter.

A coffee cup calorimeter:

It is  essentially a polystyrene (Styrofoam) cup with a lid. The cup is partially filled with a known volume of water and a thermometer is inserted through the lid of the cup so that its bulb is below the water surface.

Out of the given options,

Temperature is measured directly in a coffee-cup calorimeter.

Thus, option C is correct.

Find more information about Calorimeter here:

brainly.com/question/1407669