Final answer:
Yes, it is possible for a Class 7 material to also meet the definitions of one or more other Hazard Classes.
Step-by-step explanation:
In the context of hazard classes, a material classified as a Class 7 material is related to radioactive substances. While Class 7 materials are primarily associated with radioactivity, it is possible for a material to meet the definitions of one or more other hazard classes as well. These hazard classes could include but are not limited to flammable liquids, corrosive substances, or toxic gases. Therefore, the answer to the question is A. Yes.