Thermometer sensitivity depends on scale division size; range on total temperature span

Steps:

• Sensitivity measures smallest detectable temperature change; smaller divisions indicate higher sensitivity.
• Range is difference between maximum and minimum temperatures on the scale.
• Q has the smallest divisions, allowing finest temperature detection.
• R spans the widest temperature interval, from lowest to highest mark.

Why C is correct:

• Q's minimal division size provides greatest sensitivity per the definition of resolution in measurement scales; R's broad span yields greatest range as total measurable extent.

Why the others are wrong:

• A: P has larger divisions, so lower sensitivity than Q.
• B: S has coarser divisions, reducing sensitivity compared to Q.
• D: S has narrower span, so smaller range than R.

Final answer: C