What Is the Best Explanation of Why No Duty of Care

Multiple Choice

What is the best explanation of why no duty of care was found in Smith v Littlewoods Organisation [1987]?

A) The House of Lords would not find a duty of care as the actions of the third parties were unforeseeable to the defendant.
B) The third party's actions broke the chain of causation.
C) The defendant had omitted to do anything about the third party, but there is no general duty in respect of omissions.