Final answer:
Ritualistic behaviors are not a typical difference between children and adults with OCD, as both groups exhibit these behaviors to cope with their obsessions.
Step-by-step explanation:
The question is asking to identify which of the listed options is not a typical difference between the obsessions of children and adults with Obsessive-Compulsive Disorder (OCD). Among the choices, option c) Ritualistic behaviors is not a typical difference. Both children and adults with OCD may exhibit ritualistic behaviors as a way to manage their obsessions, though the specific rituals can vary. Regarding the other options: a) Content of obsessions can differ because children's obsessions often reflect their developmental stage and concerns, b) Intensity of obsessions can be equally severe at any age, and d) Cognitive understanding can differ because adults typically have a better grasp of the unreasonableness of their obsessions compared to children.