According to Terr (1995), what differentiates Type I and Type II traumas?

B is the correct choice because Terr (1995) differentiates between Type I and Type II traumas based on the nature of the traumatic experiences. Type I trauma refers to singular, acute incidents that happen abruptly, such as an accident or sudden loss. These experiences are characterized by a clear beginning and end. In contrast, Type II trauma involves repeated or chronic exposure to stressful events, akin to ongoing trauma that may result from factors such as abuse, neglect, or living in a war zone. The distinction emphasizes the difference in duration and impact on the individual's psychological state.

The other options do not accurately capture Terr's classifications. For instance, Type I and Type II traumas are not differentiated by time duration as indicated, nor exclusively by the types of events causing the trauma, nor specifically by the age at which they occur. Instead, the core distinction rests primarily on the abruptness versus repetitiveness of the traumatic experiences.