Which of the following is affected by rickets in the human body?

The correct answer is A) Bones.

Rickets is a bone disease that occurs due to a deficiency of vitamin D, calcium, or phosphorus. It affects the growth and development of bones in children, causing them to become soft, weak, and deformed. In adults, a similar condition is known as osteomalacia. Rickets can cause a variety of symptoms, including bone pain, muscle weakness, stunted growth, and skeletal deformities such as bowed legs, a pigeon chest, or a curved spine. It is important to treat rickets early on to prevent long-term complications.