Which type of data is available for reporting using Salesforce reports when integrating with Marketing Cloud?

The data available for reporting using Salesforce reports when integrating with Marketing Cloud includes Email Studio Send details. This is because Email Studio is a critical component of Marketing Cloud that enables the creation, sending, and tracking of email campaigns. When integrated with Salesforce, it allows for rich reporting capabilities that give insights into email performance, including open rates, click-through rates, and send statistics. This integration enhances the ability to analyze customer engagement and campaign effectiveness through Salesforce's reporting tools.

The other options, while they contain valuable interaction data, may not be readily available in Salesforce reports in the same seamless way that Email Studio Send details are. MobileConnect Message details pertains to SMS communications, Journey Builder Activity details relates to the paths customers take through marketing journeys without direct linkage to Salesforce reporting, and Interaction Studio Impression details focus on web interactions, which may require different reporting frameworks.