Which of the following are sources of information for consumers?

The correct response identifies sources of information that consumers rely on when making purchasing decisions. Internal sources refer to the personal knowledge and experiences that an individual has accumulated over time, which can influence their opinions and preferences. External sources, on the other hand, include information obtained from outside of oneself, such as friends and family, advertising, and consumer reviews. Together, these sources encompass a comprehensive range of information that consumers consider before making a decision.

This choice reflects the dual nature of how consumers gather information: from their own experiences and from the social environment around them. It's important to note that while social sources can be a component of external sources, they are not the only type of external information consumers may tap into. Other external sources could involve broader market research, public opinions, and various forms of media.

In contrast, the other choices either narrow down the types of sources (like celebrity endorsements, which represent just one aspect of external information) or incorrectly categorize them, leading to a less complete understanding of consumer behavior.