Which detail is least reliable to recall after a brief observation of a crowd?

• A. The approximate number of people present
• B. The exact license plate of a car in the distance
• C. The color of the sky
• D. The height of a person in the crowd

Answer: (B)

Memories from a brief look at a crowd favor broad, global cues over exact identifiers. When you glance quickly, your brain encodes big features and overall patterns more reliably than precise, detail-heavy information, especially when that detail is small, distant, or requires a specific sequence of characters.

A license plate in the distance is a tiny, distant, high-detail code. It needs you to recall an exact string of letters and numbers, which is easy to misread under blur, glare, or motion and then to forget after a short time. That precision is what makes it the least reliable after a brief observation.

In contrast, estimating how many people are present taps into a rough sense of crowd size, which your brain can approximate well enough from the scene. The color of the sky is a dominant, constant feature and easy to identify at a glance. Height is a rough attribute that you can gauge relative to nearby bodies, even if not exact.

So the exact license plate stands out as least reliable because it requires precise, long-term retention of a distant, detailed sequence, which brief observations typically cannot support.