Final answer:
Fire officers should assess the fire and situation and report conditions to superiors to receive instructions.
Step-by-step explanation:
On a class B fire, before beginning foam application, fire officers should determine which kind of foam is needed, and must also assess the fire and situation and report conditions to superiors to receive instructions. They should also know where specific safety equipment is located in the laboratory, such as the fire extinguisher and the eyewash station. This is important for the safety of both the officers and anyone else present.