Final answer:
The "Mr. Yuk" sticker signals a poison. OSHA, RACE, and PASS have different meanings related to safety.
Step-by-step explanation:
The correct answer is a. the "Mr. Yuk" sticker.
The "Mr. Yuk" sticker is commonly used to signal a poison. It is a symbol created by the Pittsburgh Poison Center and is widely recognized as a warning sign for hazardous substances.
OSHA (Occupational Safety and Health Administration) is a regulatory agency that oversees workplace safety and health standards. RACE and PASS are acronyms used in fire safety: RACE stands for Rescue, Alarm, Contain, Extinguish, while PASS stands for Pull, Aim, Squeeze, Sweep.