11.
The answer is: B
Explanation
The correct option is B: Mandatory and rebuttable.
Presumption of law means a legal presumption that a court is required to arrive at if certain facts are established and no contradictory evidence is produced. A presumption of law establishes a certainty, but it can be rebutted by showing that the presumed fact is false or doubtful.
For example, a person who is in possession of stolen goods is presumed to be either a thief or a receiver, unless he can prove his innocence. A presumption of law is based on the policy of the law or a general rule, and not on the facts or evidence of a particular case