Final answer:
a. 1 in the yellow quadrant. The HMIS or NFPA 704 Hazardous material identification system rating for a slightly toxic chemical would be 1 in the yellow quadrant.
Step-by-step explanation:
The correct answer is a. 1 in the yellow quadrant. The National Fire Protection Agency (NFPA) 704 Hazard Identification System assigns ratings to hazardous materials based on their level of hazard in four different categories: fire, health, reactivity, and special hazards. The yellow quadrant represents reactivity hazards, and a rating of 1 indicates a slightly toxic chemical. On the other hand, the blue quadrant represents health hazards, and a rating of 4 would indicate an extremely hazardous substance. Therefore, the rating for a slightly toxic chemical would be 1 in the yellow quadrant.