<Tr> <Td> Spot Resolutions </Td> </Tr> <Tr> <Th> 1917 World War I </Th> </Tr> <Tr> <Td> Filibuster of the Armed Ship Bill </Td> </Tr> <Tr> <Th> 1935--1939 </Th> </Tr>

Which of the following actions by germany led to the end of u.s. neutrality during world war i