As shown in the figure, the straight lines AB and CD intersect at point O, and the radial OM bisects angle AOC, ON perpendicular  OM. If angle AOC = 70.0, then the degree of angle CON is ()
Choices:
A:65°
B:55°
C:45°
D:35°
Please directly answer the question and provide the correct option letter, e.g., A, B, C, D.
Question: As shown in the figure, the straight lines AB and CD intersect at point O, and the radial OM bisects angle AOC, ON perpendicular  OM. If angle AOC = 70.0, then the degree of angle CON is ()
Choices:
A:65°
B:55°
C:45°
D:35°
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, the straight lines AB and CD intersect at point O, and the radial OM bisects angle AOC, ON perpendicular  OM. If angle AOC = 70.0, then the degree of angle CON is ()
Choices:
A:65°
B:55°
C:45°
D:35°