Bile juice is secreted by the liver and stored in the gallbladder. Its primary function is to aid in the digestion and absorption of fats (lipids). The bile contains bile salts that emulsify fats, breaking them into smaller droplets, which increases the surface area for digestive enzymes like lipase to act upon. While bile plays a crucial role in fat digestion, it does not directly digest starch or proteins. Therefore, bile juice helps in the digestion of lipids, making option (A) the correct answer.