Final answer:
In a seminar to sell mutual funds, sharing investment strategies and allowing questions from the audience are prohibited activities.
Step-by-step explanation:
In a seminar to sell mutual funds, the activities that are prohibited include sharing investment strategies and allowing questions from the audience. These activities may violate regulations and guidelines set by authorities to protect investors and ensure fair marketing practices. Providing information to attendees is not prohibited, as long as it is done accurately and in compliance with regulations.