As shown in the figure, the straight lines AB and CD are intercepted by the straight line EF. If AB parallel CD, angle 1 = 100.0, then the size of angle 2 is ()
Choices:
A:10°
B:50°
C:80°
D:100°
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 are intercepted by the straight line EF. If AB parallel CD, angle 1 = 100.0, then the size of angle 2 is ()
Choices:
A:10°
B:50°
C:80°
D:100°
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 are intercepted by the straight line EF. If AB parallel CD, angle 1 = 100.0, then the size of angle 2 is ()
Choices:
A:10°
B:50°
C:80°
D:100°