Chemco designed and built a large tank on its premises for the purpose of storing highly toxic gas. The tank developed a sudden leak and escaping toxic gas drifted onto the adjacent premises, where Nyman lived. Nyman inhaled the gas and died as a result. In a suit brought by Nyman's personal representative against Chemco, which of the following must be established if the claim is to prevail? I. The toxic gas that escaped from Chemco's premises was the cause of Nyman's death. II. The tank was built in a defective manner. III. Chemco was negligent in designing the tank.
I only. I and II only. I and III only. I, II, and III