**Core Concept**
Scurvy, a disease caused by vitamin C deficiency, affects various systems of the body, including the musculoskeletal system. Vitamin C plays a crucial role in collagen synthesis, and its deficiency impairs collagen production, leading to connective tissue dysfunction. The bone effects of scurvy are primarily due to impaired collagen synthesis and increased osteoid formation.

**Why the Correct Answer is Right**
Vitamin C is essential for the hydroxylation of proline and lysine residues in collagen, a process necessary for the formation of stable collagen triple helices. In scurvy, the lack of vitamin C leads to the accumulation of unhydroxylated collagen, which is prone to degradation by collagenases. This results in the breakdown of collagen and the formation of osteoid, leading to bone pain, osteoporosis, and increased risk of fractures. The correct answer is related to the biochemical pathway involved in collagen synthesis.

**Why Each Wrong Option is Incorrect**
**Option A:** Incorrect because it does not directly relate to the biochemical mechanism of collagen synthesis and the effects of vitamin C deficiency on bone.
**Option B:** Incorrect because it is not directly related to the pathophysiology of scurvy and its effects on bone.
**Option C:** Incorrect because it is not a direct consequence of vitamin C deficiency on bone metabolism.

**Clinical Pearl / High-Yield Fact**
Remember that scurvy can present with a range of symptoms, including bone pain, fatigue, and bleeding gums, and that early recognition and treatment with vitamin C can prevent long-term complications.

**Correct Answer: D. Impaired collagen synthesis**