Regarding the U.S. Senate in Congress:

Explanation

The U.S. Senate is a continuous body that is partially renewed every six years, meaning it is reconstituted on a staggered basis rather than dissolved entirely. Therefore, option D is correct. It is not a permanent chamber in the sense that all members remain indefinitely (A), senators serve fixed six-year terms but the body itself is renewed (B), and it cannot be dissolved by the President (C).