The pentagon papers

a. were not a political problem for nixon
b. were a secret study of the history of u. s. involvement in vietnam
c. were leaked to the new york times by robert mcnamara
d. were prohibited from being published in a landmark decision by the supreme court

a is the final : )

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: