The correct option is D Both a and b
The bile breaks down the large drops of fat into a fine suspension of smaller droplets called micelles. This process is known as emulsification. Bile contains a large quantity of bile salts as well as phospholipid, lecithin. These are extremely important for the emulsification of fat.
After emulsification, emulsified fats begin to get broken down by the action of pancreatic lipase. It helps in the digestion of fats by breaking down the emulsified fat into diglycerides and monoglycerides. It does not take part in the emulsification of the fats, instead breaks down the emulsified fats.
Hence, lecithin and bile salts are important for the emulsification of fats.