The correct answer is B) contain the spread of the oil. The first and most critical action after reporting a large oil spill is to contain the spread of the oil. This is to prevent the oil from spreading further and causing additional environmental damage. The other options, such as moving the vessel, applying straw/sawdust, or throwing sand, are not the immediate priority. Containing the spill, typically by deploying booms or other oil spill response equipment, is the necessary first step to control the situation and mitigate the impact of the spill. The other actions may be taken subsequently, but containing the spread of the oil is the crucial initial response.