The correct answer is B) all necessary components of the transfer system are lined up before the transfer begins. The U.S. regulations require that all necessary components of the transfer system, such as valves, pumps, and hoses, must be properly configured and ready for the oil transfer to begin. This ensures that the system is properly set up and reduces the risk of spills or other accidents during the transfer operation. The other answer choices are incorrect because they do not fully address the regulatory requirement. Option A is too broad, as draining unnecessary parts is not the key requirement. Options C and D describe additional safety features, but they are not the primary regulatory criteria for initiating an oil transfer.