Answer:
The correct option is 1.
Step-by-step explanation:
Rhombus is a special case of parallelogram.
The properties of a parallelogram and rhombus:
1. Opposite sides parallel and equal.
2. Diagonals bisect each other.
3. Opposite angles are congruent.
The consecutive sides of a parallelogram may or may not be equal. But a rhombus has four congruent sides.
If a parallelogram has four congruent sides, then that parallelogram is known as rhombus.
The required statement that describe a parallelogram must be a rhombus is "parallelogram with four congruent sides ".
Therefore the correct option is 1.
