Lactic acid is commonly found in __________.

tomatoes milk vinegar cumin

milk

The correct answer is option 2. milk. Lactic acid is commonly found in Milk Lactic acid is produced during the fermentation of lactose (milk sugar) by certain bacteria, such as Lactobacillus. It is a natural component of fermented dairy products like yogurt, cheese, and sour cream. Therefore, option 2, milk, is the correct answer.