The Employees of Grunwick Films Inc Have Been on Strike

The employees of Grunwick Films Inc have been on strike for more than a year.They demand better pay, but they primarily seek better working conditions.The company, however, has shown little sign of giving in to those demands.In the hope that additional pressure will soften the company's resolve, the union recently began secondary picketing.In these circumstances, that most likely means that the union

A) is engaged in an activity that the Supreme Court of Canada recently held is always lawful for unions.
B) has picketed companies that do business with Grunwick in an effort to encourage them to withdraw their business until Grunwick reaches an agreement with the union.
C) necessarily has committed a tort.
D) has doubled the number of picketers that can legally picket Grunwick's offices.
E) has violated a court order by picketing Grunwick's offices outside the hours that a judge set.