किस विटामिन की कमी से घाव देरी से भरते हैं और रोग प्रतिरोधक क्षमता कमजोर होती है?

Arrange the following physiological effects and manifestations of Vitamin D deficiency in children in the progressive chronological order of their occurrence: A. Calcium absorption becomes weak B. Low calcium levels in blood C. Soft and weak bones D. Bowed legs and skeletal deformities

Deficiency of which vitamin leads to impaired dark adaptation and night blindness (difficulty in vision during low light conditions)?