I believe the answer is Canada!
I would expect silane because all the rest have an overall dipole movement
Labels for a hazardous chemical must contain:
• Name, Address and Telephone Number
• Product Identifier
• Signal Word
• Hazard Statement(s)
• Precautionary Statement(s)
• Pictogram(s)
So the answer is product identifier.
I believe it is B... because all balance equation are supposed to follow the law of conservation of mass