Which analytics tool should be used to view the interaction timeline for all channels in Dynamics 365 for Marketing?

The correct choice for viewing the interaction timeline across all channels in Dynamics 365 for Marketing is the analytics tool called Insights. This tool provides a comprehensive overview of customer interactions with various marketing assets, ensuring that marketers have a consolidated view of how their campaigns are performing. Insights compile data from multiple channels—such as email, events, social media, and web interactions—into one central location, giving marketers access to actionable insights and a holistic understanding of customer engagement.

While other options focus on specific aspects of marketing interactions, they do not provide a complete view across all channels. Email Interactions would only provide information related to email campaigns, Event Interactions would limit insights to events, and Marketing form interactions would pertain only to data collected via forms. Thus, Insights stands out as the most suitable analytics tool for a full-spectrum analysis of customer interactions in Dynamics 365 for Marketing.