Superfoods for the bones include vitamins such as:

Vitamin D and calcium are both essential for bone health, but note the terminology issue in the question - calcium is a mineral, not a vitamin. Vitamin D helps the body absorb calcium from food, and both work together to maintain strong bones. A deficiency in either leads to bone problems like osteoporosis. Despite the minor classification error in calling calcium a 'vitamin', option C correctly identifies both nutrients as crucial for bone health.