<Tr> <Td> October 15 </Td> <Td> United Kingdom Montenegro </Td> <Td> Bulgaria </Td> </Tr> <Tr> <Td> October 16 </Td> <Td> France </Td> <Td> Bulgaria </Td> </Tr> <Tr> <Td> October 19 </Td> <Td> Italy Russia </Td> <Td> Bulgaria </Td> </Tr> <Tr> <Th_colspan="3"> 1916 </Th> </Tr>

Which of these nations remained neutral in world war i