The correct answer to this exercise is convey. A possible definition for this verb, according to several dictionaries, including Oxford and Cambridge, is: to communicate (a message or information). In the activity proposed, it's possible to infer that Teresa hadn't been able to appropriately transmit a message to her friends. None of the other possibilities provide a similar idea, or an adequate complement for the sentence. To segregate means to separate; to forsake means to quit or to abandon; to engulf means to completely cover or to overwhelm.
