Final answer:
The correct temperature range of the thermometer can is 60°C, as any temperature increase greater than about 3°C would be unreasonably large and could be dangerous.
Step-by-step explanation:
The correct temperature range of the thermometer can is option (b) 60°C.
The range of the thermometer can is based on the safe use of the product. In this case, any temperature increase greater than about 3°C would be unreasonably large, which could lead to a final temperature of 73°C (163°F), which is dangerous for the person using the product.