The suggested answer is A, D, E.
Dynamics 365 Marketing supports several key capabilities out-of-the-box that are relevant for organizing and running conferences and events. One such capability is 'Sponsors and sponsorships', which allows for management of sponsors and sponsorships for events. 'Session and speaker tracking' is also natively supported, enabling the company to manage and track sessions and speakers at events. Lastly, 'Registration and attendance' is another built-in feature, providing tools to handle the registration process and track attendance at the events. These functionalities are directly supported without needing customizations.