Complete the analogy: “A : Water :: Thermometer : B”. Choose A and B so that each second term is the property measured by the instrument or process mentioned.

Introduction / Context:
This item examines measurement associations. The right-hand pair is straightforward: a thermometer measures temperature. We must match a left-hand pair where water connects to a measurable process or phenomenon in a coherent way.

Given Data / Assumptions:

• Thermometer → Temperature (measurand).
• Water participates in physical processes like evaporation.
• We need measurement/phenomenon alignment rather than container/person.

Concept / Approach:
Ensure both sides reflect “subject/process : measured property or phenomenon.” “Evaporation” is a named physical process involving water; “temperature” is what a thermometer quantifies.

Step-by-Step Solution:
1) Fix the right mapping: Thermometer → Temperature.2) On the left, prefer a phenomenon label tied to water: Evaporation.3) Select the option that preserves measurement/process symmetry.

Verification / Alternative check:
Other choices pair objects or agents (pitcher/doctor/mercury) incorrectly. Evaporation is the only scientific process term given.

Why Other Options Are Wrong:

• Humidity/Fever: Mixed/incorrect measurands; fever is a symptom, not what the thermometer fundamentally measures.
• Pitcher/Mercury: Container and working fluid, not measurands.
• Rain/Doctor: Event and person; mismatched relation.
• Density/Pressure: Arbitrary pairing; no instrument/process consistency.

Common Pitfalls:
Choosing associated items (mercury, doctor) instead of the abstract property (temperature) or process (evaporation).

Final Answer:
A. Evaporation, B. Temperature