A company wants to understand why sales of a product dropped in a specific region and commissions door-to-door interviews with 1,000 consumers in that area. This data-collection method is an example of:

Correct Answer: B) Primary data collection through a structured survey/interview  —  the company commissions fresh, purpose-built interviews specifically to answer its own question — the defining feature of primary data collection. Why the other options are excluded: • A (secondary data) refers to data already collected by someone else for another purpose (e.g., government reports, industry publications) — not a fresh, purpose-built survey. • C (competitor analysis) would involve studying rival companies' products/strategies, not surveying one's own consumers. • D (sampling error) is a statistical concept describing a flaw in how a sample was selected, not a data-collection method itself. Example (Pension Sector): PFRDA commissioning a fresh survey of existing NPS subscribers on mobile app usability before a redesign is a similar exercise in primary data collection.