In the diagram above, line \(m\) and line \(n\) are parallel. Given that angle \(a = 40^{\circ}\) and angle

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In the diagram above, line \(m\) and line \(n\) are parallel. Given that angle \(a = 40^{\circ}\) and angle \(c = 55^{\circ},\) what is the measure of angle \(b?\)

A. \(85^{\circ}\)
B. \(90^{\circ}\)
C. \(95^{\circ}\)
D. \(100^{\circ}\)
E. Angle \(b\) cannot be determined from the information given

[spoiler]OA=C[/spoiler]

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