The answer is c because of the fact that if the 2 angles at 55 and 20 that means that you have to add them together and get to 180 for the triangle to be true
I know this doesn't help but i'm on the same thing and i just don't know
Its the third option (2, 4)
i think its D, (change my mind)
Your answer would be C. I hope this helped. :)