The most specific CSS selectors would probably be
div.c1 > li.c2 > a:link,
div.c1 > li.c2 > a:active,
div.c1 > li.c2 > a:hover,
div.c1 > li.c2 > a:visited {
color: red;
}
The more specific the CSS selectors, the less work for the browser's rendering engine.
However, something is wrong with your markup if this is supposed to be HTML and the