What Reasons Have Been Given to Justify the Principle That

What reasons have been given to justify the principle that no duty of care is owed in respect of mere omissions?
Please select all that apply.

A) Such a duty may apply to a many people who happen to be able to do something - why should one be liable any more than others?
B) Such a duty may apply to an indeterminate group of people who might happen to be able to do something in the circumstances but who could not be clearly defined before the situation arose.
C) It would be impossible for there to be a workable law imposing a duty of care in respect of omissions - essentially a duty to act.
D) There is no justification for requiring a person who is not doing anything in particular to spend money or time on behalf of someone else.