A.

1. It is a closed figure with four straight sides.

2. Two of its angles are congruent.

3. Two of its sides are parallel.

4. Two of its sides have the same length.

5. Its parallel sides have the same length.

6. Its opposite sides are congruent.

7. It has a right angle.

8. Its consecutive sides have the same length.

B.

1. It is a closed figure with straight sides.

2. It has no right angles.

3. It has no parallel sides.

4. It has no diagonals.

5. It has an exterior angle that measures 120 degrees.

6. It has three lines of symmetry.

C.

1. It is a closed figure with straight sides.

2. It has a pair of opposite sides that are congruent and parallel.

3. It has another pair of opposite sides that are congruent and parallel.

4. Its consecutive sides are not congruent.

5. The sum of the measures of all of its angles is 360 degrees.

6. It has no right angles.

D.

1. It is a closed figure with straight sides.

2. The sum of the measures of all its angles is less than 360 degrees.

3. One of its angle bisectors lies on the perpendicular bisector of one of its sides.

4. It has a pair of complementary angles.