Final answer:
A descriptive research design may not be the most appropriate choice when the research objective is to gain an insight into the deeper emotions or feelings behind a purchase decision.
Step-by-step explanation:
A descriptive research design may not be the most appropriate choice when the research objective is to gain an insight into the deeper emotions or feelings behind a purchase decision. This is because a descriptive research design focuses on describing characteristics and collecting data without manipulating variables or making causal claims. To gain insights into emotions or feelings, qualitative research methods like interviews or focus groups may be more suitable.