Answer
C. He authorized a 700-mile-lon fence along the US border with Mexico.
Explanation
President Bush authorized the construction of a 700 mile long fence .A pool of 80-19 was conducted on 29/9/2006 where the senate established H.R 6061 approval and backing of the fence construction along the border. In addition to that Bush administration increased the size of the Border Patrol to 1000 new agents. The boarder control further installed monitoring devices to detect any border illegal activities.
