Can u plz be more specific for example show us the document or something thx my love enjoy ur day!
For the very reason that us as Americans have been in this two-party system for so long that we would want to keep this tradition rather than to add another party, and oppose eachother even more. Also, voters feel that having a third party vote is irrelevant because it is less likely to be voted for and won over.
The answer to you question would be C.
hope this helps