As shown in the figure, points A, B, and C are on circle O, angle ABO = 40.0, angle ACO = 30.0, then the degree of angle BOC is ()
Choices:
A:60°
B:70°
C:120°
D:140°
Please directly answer the question and provide the correct option letter, e.g., A, B, C, D.
Question: As shown in the figure, points A, B, and C are on circle O, angle ABO = 40.0, angle ACO = 30.0, then the degree of angle BOC is ()
Choices:
A:60°
B:70°
C:120°
D:140°
Please first conduct reasoning, and then answer the question and provide the correct option letter, e.g., A, B, C, D, at the end.
Question: As shown in the figure, points A, B, and C are on circle O, angle ABO = 40.0, angle ACO = 30.0, then the degree of angle BOC is ()
Choices:
A:60°
B:70°
C:120°
D:140°