Which of the Following Statements Is TRUE with Respect to Picketing

Which of the following statements is TRUE with respect to picketing?

A) because of the desire to promote a free exchange of information and ideas, statements made during picketing are protected from liability in defamation by the defence of absolute privilege.
B) Picketing is prohibited unless it is expressly permitted by a collective agreement.
C) because most employment contracts involve private parties, activities performed during a picket seldom involve criminal law.
D) A picket is defined as an organized effort to persuade consumers to either purchase a particular product or purchase from a particular business.
E) Secondary picketing against a party that is not directly involved in a labour grievance is generally lawful as long as it does not involve tortious or criminal activity.