Answer:
B. is exactly 1 triangle
Step-by-step explanation:
For any given triangle, the sum of the internal angles is [tex]180^{o}[/tex]. Thus from the given question, adding the given angles;
30° + 70° + 80° = [tex]180^{o}[/tex]
Therefore, only one triangle can be produced with the given measure of angles. This implies that there is exactly one triangle. So that the correct option is B.