Answer:
A) Breach, because the latter express warranty is valid.
Explanation:
Based on the scenario being described within the question it can be said that the result would be a breach. This is mainly due to the fact that the box stated that "will protect your feet in temperatures down to 30° below zero." and this is a valid express warranty that is being marketed by the company that created the product. Therefore since the temperature did not go below 30 and Ron still suffered frostbite then he can rightfully sue.