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

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)