The correct answer is option B, that is, digestion of food.
Digestion of food in the body is a decomposition reaction, it is a kind of chemical reaction in which single compound dissociates into two or more basic components. In the process of digestion, proteins, carbohydrates, and fats dissociate to basic constituents, which provide energy to function.
Digestion of food is regarded as chemical change as different chemical reactions occur at the time of food digestion.
point mutation, change within a gene in which one base pair in the DNA sequence is altered. Point mutations are frequently the result of mistakes made during DNA replication, although modification of DNA, such as through exposure to X-rays or to ultraviolet radiation, also can induce point mutations
