In the us, third parties have yet to a. hold public office b. win the presidency c. impact election results d. increase voter participation

The only Answer that I think would fit is B. They probably have held office kand they did probably have an impact in the other election and they might increase the election. i would chose B but its your choice  
Hope this helps,
 
Hardewil000

I do believe the answer is B hope this helped

Idk i’m not smart so yeah sorry