Pickets May Prevent Trucks and Railcars from Entering a Struck

Multiple Choice

Pickets may prevent trucks and railcars from entering a struck business because of which of the following?

A) Picketing during a strike carries a legal obligation on the part of the employer to cease operations, including delivery of goods and materials.
B) Unions often refuse to cross another union's picket line.
C) The union has a legal right to obstruct the business of the employer the union is striking against.
D) Operators of trucks and railcars must get permission from the picketing union to enter the premises.