Answer:
A). The product must be unreasonably dangerous.
Step-by-step explanation:
The 'product liability theory of strict liability' law may consider the manufacturer or retailer liable for injuries caused by the use of their product even if that product has been designed safely for the consumers and it contains a warning label also that clearly states the harm it may cause. But the application of strict liability takes place only on the condition of 'the product being unreasonably dangerous' and the risk of harm(as thought by manufacturer) surpasses the advantages. Thus, option A is the correct answer.