The correct statement is Option B:- Option BA straight current-carrying conductor has circular magnetic field lines around it.Why the others are incorrect:Option AA neutral, current-carrying wire does not produce an electric field around it (externally it remains electrically neutral).Option CFleming's Left-Hand Rule gives the direction of force on a current in an external magnetic field, not the field created by the current itself. The field around a straight conductor follows the Right-Hand Thumb Rule.Option DInside a long, closely wound solenoid the magnetic field is essentially uniform along its length.