Final answer:
Brand salience, option a, is the frequency and ease with which customers think of a brand under different situations.
Step-by-step explanation:
The frequency and ease with which customers think of a brand under various purchase or consumption situations is known as brand salience.
Brand salience refers to the degree to which a brand is present in the customer's mind and considered in their decision-making process. It is influenced by factors such as brand recognition, brand recall, and brand awareness.
For example, if a customer easily remembers and thinks of a particular brand when considering purchasing a specific product or when consuming a certain product category, it indicates a high level of brand salience.