For the quadrilateral on the grid, the slope of WX is 0, the slope of XY is 5/2, the slope of YZ is 0, and the slope of ZW is 5/2. Which statement verifies that quadrilateral WXYZ is a parallelogram?

Nina has prepared the following two-column proof below. she is given that ∠oln ≅ ∠lno and she is trying to prove that ol ≅ on. triangle oln, where angle oln is congruent to angle lno nina made two errors in the proof. identify and correct the errors.