By citizens can affect the direction of their government.

I think the answer is  A. Voting

Explanation:

Paying taxes doesn't affected the direction of the government, serving in the armed forces doesn't change the direction of the government, and serving in the jury doesn't change the direction of the government. Voting can cause new leaders to be elected which can directly change the direction of the government.

in contrast, the biological controls are self-sustaining, inexpensive and very effective once established. biological control could be used on thousands of golf course acres, improving their biodiversity and quality as wildlife habitat. in the process, the golf industry will be shown to be leaders in an environmental stewardship program of benefit not only to the lands they manage but also to the watersheds in which they exist.

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: