Answer: That is C. A thermacouple
Explanation: A thermocouple is a sensor or device that is use for measuring temperature. It contains two dissimilar metallic wires which are joined together to form a junction. and when the junction is cooled or heated, a small voltage is then generated in the electrical circuit which makes it read or measured which corresponds to temperature. As the temperature changes, the two dissimilar metals begin to deform, causing a change in resistance.