Which of the following timelines identifies the cause of aggression and conflict that led to name nanjing in China and contributed to the beginning of world war II

Answer 1

1. Japanese invasion of Manchuria (1931) --> Marco Polo Bridge Incident (1937) --> of Nanjing (1937)
2. Treaty of Versailles (1919) --> Japanese militarism and expansion (1920s-1930s) --> Marco Polo Bridge Incident (1937) --> of Nanjing (1937)