The correct option is D Contamination of food
Eating a ripened mango, cooked rice and sour curd will not cause any harm to us. So, tasting can be done to identify the change in them.
Eating contaminated food may cause food poisoning which can have an adverse effect on our health. So, testing contaminated food by tasting can be harmful. Instead, we can use other indicators of change like the smell because contaminated food usually produces a foul smell.