Explanation:

Einstein Lead Follow-Up is designed specifically to help sales teams engage with leads at scale using AI-generated, personalized emails based on:

Lead data
Past interactions
CRM context

It’s tailored to automate and streamline outreach with hyper-relevant messaging, making it the best solution for a sales manager who needs to contact many leads efficiently and effectively.

A. Einstein Sales Assistant
❌ Incorrect – This feature helps sales reps prioritize work, get reminders, and receive insights, but it doesn't generate communications at scale or handle personalized follow-up automatically.

B. Prompt Builder
❌ Incorrect – Prompt Builder is a tool for creating custom AI prompts, mainly for developers or admins building AI use cases. It’s not a ready-to-use lead follow-up solution for sales managers.