Text: Since the largest item contributing to the steel requirement is the storage silo, it will be assumed that the total steel requirement is proportional to the capacity of the unit, as the storage requirement would be proportional to the capacity.
Entailment: For the purposes of this explanation, it is going to be assumed that the capacity of the unit is proportional to the total steel requirement.
Contradiction: There is no relationship between total steel requirement and the unit's capacity.