Which one of the following is a rare disease caused by the deficiency of Vitamin D that causes the bones to become soft and to bend?

Rickets

The correct answer is Option (4)- Rickets

The rare disease caused by the deficiency of Vitamin D that leads to the softening and bending of bones is called Rickets. Rickets primarily affects children, causing deformities in the bones and impairing their growth and development. The insufficient levels of Vitamin D hinder the proper absorption of calcium and phosphorus in the bones, leading to weakened and deformed skeletal structures. Therefore, Rickets is directly associated with Vitamin D deficiency and its impact on bone health.