Why was the salt march a turning point in india’s struggle for independence?

Here’s the first one let me send the next page of the passage

Following archduke franz ferdinand's assassination, austro-hungarian leaders: a. aided the ottoman empire in its campaign to keep serbia under its control. b. executed nearly all prominent serbs living in austria-hungary c. threatened to invade serbia if serb leaders did not agree to a set of strict demands. d.. formed an alliance with great britain to protect austria-hungary from future attacks.

During what century did muhammad recieve his first revelation from god