Which of the following is NOT a suitable storage area for flammable liquids?

The option indicating that storing flammable liquids on a lab bench is not suitable is accurate because lab benches do not offer any protective measures against accidents or fire hazards. Flammable liquids are volatile and can easily ignite from heat sources or sparks, making it critical to store them in safe environments designed to minimize risk.

Fireproof cabinets and designated flammable storage rooms are specifically designed to contain flammable substances safely. These storage solutions incorporate materials and construction methods aimed at preventing fire spread and protecting the contents from environmental factors that could lead to ignition.

Lab benches, on the other hand, are often not secure or isolated from heat sources and other chemicals, posing significant safety dangers. Proper storage practices aim to ensure that flammable materials are kept in controlled locations, away from workspaces where they can inadvertently come into contact with ignition sources or be accidentally spilled. Thus, option B correctly identifies an unsuitable storage location for flammable liquids.