The correct answer is:
D. becoming a dominant party
Explanation:
1. Third parties can be successful in supporting a specific issue, such as advocating for environmental conservation or healthcare reform.
2. They can also form as protest groups to highlight social or political issues and push for change.
3. Third parties can influence election results by bringing attention to certain topics or offering alternative perspectives to voters.
4. However, third parties typically struggle to become dominant parties in the political landscape due to the dominance of major parties like Republicans and Democrats in the U.S. political system.