Given that $\angle A$ and $\angle B$ are supplementary, Daisy conjectured that $\angle A\cong \angle B$ Which statement is a counterexample to Daisy's conjecture? $m\angle A=90^{\circ }$ and $m\angle B=90^{\circ }$ $m\angle A=45^{\circ }$ and $m\angle B=45^{\circ }$ $m\angle A=40^{\circ }$ and $m\angle B=140^{\circ }$ $m\angle A=50^{\circ }$ and $m\angle B=120^{\circ }$