According to the material, what is the best source of protein?

• A. Dairy
• B. Grains
• C. Vegetables
• D. Meat

Answer: (C)

Protein quality and overall diet context are being tested here. The material treats vegetables as the best source of protein because they provide meaningful amounts of protein while also delivering fiber, vitamins, and minerals, and they come with lower saturated fat and cholesterol than animal products. When you include a variety of vegetables—especially legumes like beans, lentils, and peas—you can build a substantial protein intake without the downsides of meat or dairy. Plant-based proteins from vegetables become complete when you mix different plant foods, so vegetables can form the core of a healthy, protein-rich pattern. While meat and dairy offer high-quality protein, the material highlights the health and sustainability advantages of plant-based sources. Grains contribute protein too, but typically in smaller amounts and with different amino-acid balance, which is why combining vegetables with other plant foods helps round out the amino acid profile. This is why vegetables are viewed as the best source of protein in the material.