Answer:
The correct answer will be option-D
Explanation:
The studies done by the scientist led to the conclusion that the doges were evolved from the wolves,
The interaction of the wolves with humans became symbiotic around 10000-15000 years ago when the wolves in search of food changed themselves and adapted to survive with humans.
The studies on the genes of Dog shows that the gene responsible to digest carbohydrate called amylase starting duplicating in Wolves allowing them to digest carbohydrate cereals offered by humans. Their pancreatic enzymes also got modified to digest the carbohydrate-protein rich cereals.
Thus, option-D is the correct answer.