Select and element from the choices given showing how the element burns in Oxygen gas.(Phosphorous, Sulphur, Sodium, Magnesium)

(i)Burns in oxygen brightly forming a white solid which is soluble in water                        
                                                                                                              
(ii) Burns in oxygen with a yellow flame forming a white solid which is very soluble        
in water                                                                                                                        
                                                                                                           
(iii)Burns in oxygen forming white dense flames                                                                  
                                      
(iv) Burns in oxygen with a blue flame forming a colourless gas which dissloves into        
an acidic solution