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it would be the angle DAB=90 degrees.
its either the first answer or the fourth answer because it only has 3 points not telling us if there is any more than just 3
***I thought it was the third answer
the measurements can be different with the third answer it doesn't say that all the sides are equal. I read it carefully and the best answer i can think of is the first one.
Answer D is not it. A parallelogram has two pairs of congruent opposite angles. If only one angle is known to be a right angle, then the angle opposite that angle is also a right angle. Those two opposite angles add up to 180 degrees. There are 180 degrees left for the other two angle, but since they are congruent, they measure 90 degrees each, so all angles are right angles and it's a rectangle.
Answer B is also not it. If a parallelogram has congruent diagonals, then it is a rectangle.
Answer A is also not it. The diagonals of a parallelogram bisect each other. The diagonals of a rectangle are congruent. If those two half diagonals are congruent, then the diagonals are congruent and this parallelogram is a rectangle.
That leaves only choice C. If each pair of adjacent sides of a parallelogram is congruent, then that makes the parallelogram a rhombus, but it does not make it a rectangle.