Explanation
The consultant should recommend Pardot as a solution to meet the requirement of sending mass emails to constituents in their territories and automating donor prospect prioritization based on engagement and specified criteria for the major gift officers. Pardot is a product that allows users to create and manage personalized and targeted marketing campaigns for customers or prospects. Pardot can help the major gift officers send mass emails to constituents in their territories using features such as email templates, dynamic content, or email preference centers. Pardot can also help the major gift officers automate donor prospect prioritization based on engagement and specified criteria using features such as lead scoring, lead grading, or automation rules. foundationConnect, Salesforce Inbox, and Marketing Cloud are not solutions that can meet the requirement of sending mass emails to constituents in their territories and automating donor prospect prioritization based on engagement and specified criteria for the major gift officers. References:
https://www.salesforce.com/products/pardot/overview/
https://trailhead.salesforce.com/en/content/learn/modules/pardot-basics