Step 1: Understanding nutrient enrichment.
Calcium is an essential mineral required for strong bones and teeth. Green leafy vegetables are generally rich sources of calcium.
Step 2: Nutritional value of spinach.
Spinach is a green leafy vegetable that contains a high amount of calcium along with iron and vitamins, making it nutritionally superior in terms of mineral content.
Step 3: Analysis of options.
(A) Spinach: Correct, as it is a well-known calcium-rich vegetable.
(B) Carrot: Rich in vitamin A but not particularly high in calcium.
(C) Pumpkin: Contains vitamins but has low calcium content.
(D) Mustard: Seeds contain oils, but leaves are less commonly noted for calcium enrichment compared to spinach.
Step 4: Conclusion.
Spinach is enriched with calcium and hence is the correct answer.