Which of the following is typically a primary research supplier?

The selection of Nielsen as a primary research supplier is accurate due to its established role in providing comprehensive data and analytics on consumer behavior and market trends. Nielsen specializes in gathering, analyzing, and interpreting data across various sectors, particularly in media and consumer goods. Its work often involves conducting surveys, panels, and other primary research methods to generate insights that help businesses understand market dynamics and the effectiveness of their advertising strategies.

In contrast, the other options—Google, Facebook, and Amazon—primarily act as platforms and services that can provide data and insights but do not focus solely on conducting primary research in the traditional sense. While these companies do collect vast amounts of user data and can analyze it for advertisers, they are not typically categorized as primary research suppliers on the same level as Nielsen, which is dedicated specifically to research methodologies and the generation of original data.