The first sentence is wrong, there shouldnt be a comma in it at all
An independent clause<span> (a </span>clause<span> is a group of words that contains at least one subject and one verb) is one that can stand on its own two feet--independently. You can join independent </span>clauses<span> if you want to. This is called coordination. A </span>dependent<span>person is one who needs help from another, more independent person. </span>
- <em>the answer "a" Is correct !</em>
<em>In his pre presidential years he was one of America's greatest diplomats—formulating, among other things, what came to be called the Monroe Doctrine—and in his post presidential years (as a U.S. congressman, 1831–48) he fought against the expansion of slavery.</em>
I personally think "Two teams, the Tomcats and the Huskies, battled for the city championship." is the best
