Milk is a rich source of proteins, which are vital for growth, repair, and maintenance of body tissues.

Understanding Protein-Rich Foods
Protein is an essential nutrient that plays a crucial role in building and repairing tissues, making enzymes and hormones, and supporting overall bodily functions. Different foods provide varying amounts of protein, and identifying those that are protein-rich is important for a balanced diet.

Analysis of the Options
- Apples: Apples are primarily a source of carbohydrates and fiber. They contain very little protein, making them a poor choice for those seeking protein-rich foods.
- Almonds: Almonds are indeed a good source of protein, offering about 6 grams of protein per ounce. They are also rich in healthy fats and nutrients, but they are not the highest in protein compared to milk.
- Milk: Milk is an excellent source of protein, providing approximately 8 grams of protein per cup. It contains all essential amino acids, making it a complete protein source. This is why milk is often recommended for growth and development, especially in children.
- Rice: Rice does have some protein, but it is relatively low compared to other options, with about 4 grams of protein per cup. Additionally, rice is primarily a carbohydrate source.

Conclusion
In summary, among the given options, milk is the richest in protein. It is beneficial for growth, muscle repair, and overall health. While almonds also contain protein, milk has a higher protein content and is considered a complete protein source, making it the best choice from the options provided.