Which of the following is true about U.S supreme court justices?
A. they are appointed by the president, approved by the house, and may serve for 10 years.
B. they are appointed by the senate, approved by the house, and may serve for 10 years
C. they are appointed by the president, approved by the senate, and may serve for life
D. they are appointed by the house, approved by the senate, and may serve for life.