Final answer:
An external stimulus is a factor in the consumer's external environment that triggers awareness of a need for a product or service.
Step-by-step explanation:
An external stimulus is the term that best describes a stimulus that sparks the awareness of a need outside of a consumer. This refers to any factor or event in the consumer's external environment that triggers a recognition of a need or desire for a particular product or service. Examples of external stimuli include advertisements, recommendations from friends or family, seeing a product on the shelf, or observing someone else using a product.
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