Impressions measure the visibility of your ads and are the primary metric for evaluating and optimizing awareness goals in Amazon Ads campaigns.

• Store visits
• Return on ad spend (ROAS)
• Impressions

The correct answer is: Impressions

Explanation: Impressions are the key metric to measure your awareness goals in Amazon Ads. Impressions reflect the total number of times your ad is shown to users, indicating how visible your brand or product is to potential customers. High impression numbers indicate wide reach and strong brand visibility, making this metric the foundation for analyzing campaign awareness.

Reference:  https://advertising.amazon.in/help/GG44RFW942U9F6F5