Which option best represents the complete warning sign as described?

• A. Warning; No smoking
• B. Dangerous cargo; Keep out
• C. Warning; Dangerous cargo; No visitors
• D. Warning; Dangerous cargo; No visitors; No smoking; No open lights

Answer: (D)

The main idea is that warnings for hazardous cargo areas must clearly state the hazard and all the precautions that apply. A complete warning sign should begin with a general alert, identify the specific hazard, and include every restriction that helps prevent accidents—such as prohibitions on visitors, smoking, and ignition sources.

This is why the full sign is best: it communicates at a glance that there is dangerous cargo present and lays out all the necessary precautions—no visitors, no smoking, and no open lights—so anyone approaching the area knows exactly what is prohibited and why. The other options omit one or more of these essential elements, leaving potential gaps in safety messaging.