The correct option is "into".
Yesterday, Adam ran **into** Helen.
**Translation:** Вчера Адам врезался в Хелен. (встретил Хелен неожиданно)
Explanation:
The phrase "run into" means to meet someone unexpectedly. The other options don't make sense in this context.
Translation of the choices:
* out off - нет смысла
* under - под
* out of - из
* into - в (случайно встретил)