Cloud Kicks want to track the return on investment (ROI) of its marketing campaigns for...

Campaign Influence allows tracking multiple marketing campaigns that have impacted an opportunity, making it an ideal solution for measuring the ROI of marketing efforts such as trade shows and webinars. By enabling Campaign Influence, Cloud Kicks can associate opportunities with one or more campaigns, thus measuring the influence and ROI of each campaign.

Tracking Campaign ROI: Campaign Influence enables users to see how campaigns contribute to closed deals. It allows for custom attribution models, giving flexibility in how influence is measured.

Visibility on Opportunity Records: By adding Campaign Influence to the Opportunity page layout, sales reps can easily view which campaigns influenced an opportunity, which supports ROI analysis.

Option A (Primary Campaign Source) limits tracking to a single campaign, and Option C (creating a custom field) would not provide the multi-campaign tracking flexibility available with Campaign Influence. For more on setting up and using Campaign Influence, refer to Salesforce Campaign Influence documentation.