Concept:The sensitivity of a thermometer is the smallest temperature change it can detect or measure.
Explanation:Option D is correct because sensitivity describes the finest or smallest change in temperature that the thermometer can register.
Option B, “how quickly a temperature change can be detected,” refers to responsiveness, not sensitivity.
Option C, “the difference between the maximum and the minimum temperature,” describes the range of the thermometer, not its sensitivity.
Therefore, the definition that best matches sensitivity is the smallest temperature change that can be detected or measured.
Answer:D. The smallest temperature change that can be detected or measured.