Users can be imported into Marketing Cloud Account Engagement from a CSV file or from Salesforce3. You can also manually add users individually or in bulk3. Importing users can help you save time and ensure consistency in your user management3

According to the Salesforce documentation, the advice that should be offered to the client who is looking for a way to increase the quality of leads that are being passed from marketing to sales is: B) Implement a blended lead scoring and grading system. A lead scoring and grading system is a feature that allows users to measure and qualify the prospects based on their level of interest and fit for the business. A lead scoring and grading system can help users to prioritize and segment the prospects, and to pass the most qualified leads from marketing to sales. A lead scoring and grading system consists of two components: scoring and grading. Scoring is a numerical value that indicates the level of interest and engagement of a prospect, based on their activities, such as opening an email, clicking a link, or submitting a form. Scoring can be done automatically by the default scoring model in Marketing Cloud Account Engagement, or manually by customizing the scoring rules. Grading is a letter value that indicates the level of fit of a prospect, based on their attributes, such as industry, job title, location, or company size. Grading can be done manually by creating profiles and matching them with the prospect's information. By implementing a blended lead scoring and grading system, the client can increase the quality of leads that are being passed from marketing to sales, as they can identify the prospects who have both a high score and a high grade, meaning that they are both interested and suitable for the business. Only passing on leads that are very active on the site no matter the company profile, automatically assigning all leads to sales reps in a round-robin system, or adding more landing pages and forms to the site to increase the number of conversion opportunities are not the best advice that should be offered to the client who is looking for a way to increase the quality of leads that are being passed from marketing to sales, as they are either ineffective, inefficient, or irrelevant ways of qualifying and prioritizing the leads. Reference: Salesforce documentation