Answer:
D.
Step-by-step explanation:
The factors that infuence a consumer's decision of buying product are multiple. It can be internal, external, economic, cultural, etc.
These factors include psychological factor, social factor, cultural factor, situational factor, etc.
Many times it's psychological factors such as moods. If a person is in bad or good mood, it will affect his behavior to buy a product. Culture or social life also influences consumer's buying habit. Some buy under peer pressure or to have status in society.
Therefore, option D is correct.