The correct answer is B. Read the product label or the SDS. Be familiar with chemicals and cleaning solutions before they are used.

While looking up the chemical online may get you the same information, the label and SDS sheet are the fastest and most comprehensive way to determine if a chemical is hazardous.

Under the Hazard Communication Standard (HCS), any chemical is considered hazardous if it is classified as a physical hazard, a health hazard, a simple or moderate irritant to the eyes or skin, or an inhalation danger. It is also considered hazardous if it is flammable, or if it is a hazard not otherwise classified.

Be sure to  read the “Precautionary Statements” on the label of the product. An ordinary glass cleaner includes: “Prolonged or repeated contact can result in defatting and drying of the skin. Intentional missuses by concentrating and inhaling the product can be harmful or fatal.”