Which cause has to do with agreements between nations to provide aid and protection? In WW1

B. Alliances

Explanation:

Alliances between major countries made sure they both defended each other's land and provide aid whether its ammunition or medical supplies. The two major alliances during WW1 was the Allies and Central Powers.

Triple Entente:

-British Empire

-France

-Russian Empire

Other Allies with the Triple Entente:

-Kingdom of Italy (Used to be allies with Germany in the Triple Alliance)

United States (Joined in 1917)

-Kingdom of Serbia

Central Powers:

German Empire

Austria-Hungary Empire

Ottoman Empire

Bulgaria

answer: the time zones used to be whatever the local authority wanted them to be. one town might have 6am whenever the sun came up and another town had 6am 10 minutes later.  

the trains had a hard time when their orders said to be at a certain point at 6am.  

6am, but who's 6am.  

the railroads got together and set the time zones more or less along the longitude lines across the country.

explanation:

your answer is c i hope that