This is justified because a rhombus has to have 4 right angles to be a square but the square only needs 4 connecting lines to be a rhombus.
A,B,C are all correct. A square and parallelogram have 4 connecting lines which makes it a quadrilateral. Squares and parallelogram has two pairs of parallel lines because they have two pairs of lines of the same length which is opposite each other. The trapezium only has one pair of lines with the same length of the opposites so it only has a pair of parallel lines
This statement is true because the picture clearly shows that both pairs of opposite lines are parallel and there is a trapezium provin it too. Because BC and ED are parallel, this proves that all the sides are the same and makes it a parallelogram