How do you solve this? If you can answer on paper

Answer:
B
Step-by-step explanation:
First of all
We also know that smallest side is opposite the smallest angle and largest side is opposite the largest angle. The remaining side opposite of remaining angle.
It is given
A = 80
B = 30
C = 70
So, largest angle is Angle A and opposite side is BC
2nd largest angle is Angle C and opposite side is AB
smallest angle is Angle B and opposite side is AC
So, sides Largest - Smallest is:
BC, AB, AC
That is option B