For sponsored ads Cost-per-Click (CPC) campaigns, only click events are eligible for attribution of conversion events.

This statement is true. For sponsored ads with a Cost-per-Click (CPC) model, attribution for conversion events is solely based on click events. This means that a conversion is attributed to an ad only if a user clicked on that specific ad within the defined attribution window before completing the conversion. Impressions (views of the ad without a click) are not considered for attribution in CPC campaigns, even if they might have influenced the user's decision. This model directly links ad spend (which is based on clicks) to performance metrics like conversions, making it a fundamental aspect of how CPC campaigns are measured and optimized.