Concept:A dyke is an igneous intrusion that cuts across the existing bedding planes of rock layers.Explanation:Molten magma often forces its way through cracks or fractures in the rocks.When these fractures cut across the bedding planes, the magma cools and solidifies to form a dyke.A sill forms when magma spreads parallel to the bedding planes, so it is not correct here.Batholiths and laccoliths are large intrusive bodies, but they do not form specifically by cutting across bedding planes.Answer:B. dyke