Adding vegetables to food to improve nutrition is an example of what?

Correct answer: Nutrition improvement

The direct answer is option A, nutrition improvement. Adding vegetables can improve the nutritional quality of a dish because vegetables commonly provide vitamins, minerals, fibre, water, and sometimes useful protective plant compounds. The reasoning is simple: vegetables are added; their nutrients enter the meal; therefore the meal can become more varied and nourishing. Option A correctly names this purpose. Option B, hiding food, has nothing to do with increasing nutrients; hiding changes visibility, not nutritional value. Option C, closing the kitchen, is an action unrelated to adding vegetables and would not improve the dish. Option D, spoiling ingredients, means damaging food quality, which is the opposite of improvement. The exact nutrient amount depends on the vegetable, quantity, and cooking method, but the educational idea in this question is clear. Memory cue: adding wholesome food is generally linked with improving nutrition.