Correct option is (B) 100°, 80°, 100°
\(\because\) ABCD is a parallelogram.
\(\therefore\) \(\angle B=\angle D\) = \(80^\circ\) \((\because\) Opposite angles are equal in a parallelogram)
Also \(\angle A+\angle B\) \(=180^\circ\) (Sum of two consecutive angles is \(180^\circ\) in a parallelogram)
\(\Rightarrow\) \(\angle A\) \(=180^\circ-\angle B\)
\(=180^\circ-80^\circ=100^\circ\)
\(\Rightarrow\) \(\angle C=\angle A\) \(=100^\circ\)
Hence, \(\angle A\), \(\angle B\) and \(\angle C\) are \(100^\circ\), \(80^\circ\) and \(100^\circ\) respectively.
