Vitamin d deficiency during childhood leads to a condition of weak and malformed bones known as .

Ricket.

Explanation:

Ricket is a disease in children caused by vitamin D deficiency, characterized by imperfect calcification, softening, and distortion of the bones typically resulting in bow legs and this is because Vitamin D promotes the body’s absorption of calcium and phosphorus.

your answer will be c. sorry if im wrong: )

hey, the answer to your question would be a.) progressive resistance training.