What was the role of the committee of public safety?

The Committee of Public Safety sought to bring order to France and insure that all citizens were loyal to the Revolution.  Led by Maximilien Robespierre, the Committee of Public Safety imposed "The Terror" in 1793-94, a program which intimidated citizens into loyalty to the republic.  An enormous number of citizens were executed by guillotine simply on suspicion of disloyalty or lack of full support of the Revolution's goals.

c. troops marched forward in close formation against newer, more accurate weapons

the triple alliance. germany and austria-hungary were already allies by 1879 when, worried about a threat from russia, they formed the dual alliance. italy joined the group in 1882. there was a concern about a possible attack from france and the alliance needed powerful friends to defend it.