Wesley has been advertising his graphic design books on Amazon for over a year. He notices the campaign performance has been slightly declining, and he wants to know which keywords aren't performing well. Which downloadable report should he use?

The targeting report is the correct choice because it provides performance metrics broken down by individual targets, including keywords. This allows Wesley to identify specific keywords that are underperforming and adjust his strategy accordingly. The placement report shows where ads appeared, not keyword performance. The advertised product report focuses on the performance of the products themselves, not the keywords driving traffic to them. The search term report shows the actual search queries customers used, which is useful for discovering new keywords, but the targeting report is specifically designed to evaluate the performance of existing keywords.