What prompted Italy to declare war on Austria-Hungary in April 1915?
Correct answer: Promises made in the Treaty of London

Das
In the time of great need ,Promises are easily made and after the Victor got what they wanted, lt becomes very difficult to fullfill all the "sweet mouth" promises, because they were never made in good faith .Sweet Mouth
is simple saying things to
make one feels good in ord to get what you want .