Observations that are/can be measured.

• A. Qualitative Observation
• B. Theory
• C. Quantitative Observation
• D. Development

Answer: (C)

Quantitative observation centers on measurements and numbers. It involves collecting data that can be quantified with units, like length, mass, temperature, time, or counts. This type of observation lets you compare data precisely and analyze it statistically—for example, recording that a plant grew 12 cm in a week or that 25 leaves were counted on a sample plant.

Qualitative observations, by contrast, describe properties without numbers—color, shape, texture. A theory is an explanation, not an observation. Development refers to growth or change over time, a process rather than a specific measured quantity. When a prompt asks for observations that can be measured, quantitative observation is the best fit because it focuses on numerical data.