Answer: Option (a) is the correct answer.
Step-by-step explanation:
When we cook food then its fragrance or smell makes us feel to eat it as we feel hunger. Also, the way a dish is presented makes us realize how tasty it would be.
Hence, we feel to taste it and want to know exactly how it is actually. Therefore, psychologically we think about the dish.
Thus, we can conclude that the taste, smell, and presentation of food have a psychological influence on food digestion.