The correct option is B 28 July, 1914
Post the Sarajevo crisis, Austria sent an ultimatum to the Serbian government demanding the handover of all the associated criminals Post the Sarajevo crisis, Austria sent an ultimatum to the Serbian government demanding the handover of all the associated criminals and strict ban on anti-Austrian meetings and publications. Serbia refused to accept Austria’s demands because Serbia thought that it would lead to the loss of its sovereignty. This made Austria declare a war on Serbia on 28 July, 1914.and strict ban on anti-Austrian meetings and publications. Serbia refused to accept Austria’s demands because Serbia thought that it would lead to the loss of its sovereignty. This made Austria declare a war on Serbia on 28 July, 1914.