Which of the Following Actions by Workers Is Subject to Court

Which of the following actions by workers is subject to court action, such as an injunction being issued against the workers:

A) when workers attempt to get other workers to join in picketing a company
B) when a union pays unemployment benefits to striking workers
C) when workers refuse to sign a contract, as a condition of employment, that they will not join a union
D) when workers talk to the media about the details of a labor dispute at a company
E) none of the other choices is likely to be subject to court involvement