Final answer:
The risk phrase among the options provided is 'c) Highly flammable' which serves as a warning about the potential for a substance to catch fire easily.
Step-by-step explanation:
The question at hand is asking which option among the provided choices is a risk phrase related to safety in a laboratory setting. A risk phrase is a statement used to describe the potential hazard of a chemical substance or procedure.
The correct answer is c) Highly flammable, which is a risk phrase indicating that a substance can easily catch fire. This phrase serves as a warning to handle the substance with care to prevent fire-related accidents in the laboratory. Option b) Wear eye protection is a safety instruction, while d) Use only with proper ventilation suggests a method of risk control. Option a) Identify with a correct WHMIS label is a directive to label substances correctly according to the Workplace Hazardous Materials Information System (WHMIS).