Respuesta :
i think it could be 6,7,8 because if you put the six first then the 7 on the bottom and the 8 connecting the other ends of the 6 and 7 then it makes a right angle. i hope this helped. sorry if my explanation is a little confusing
The correct answer is C. 5, 12, 13
Hope it helps and have a wonderful rest of your day/night!