Don has an obsessive-compulsive disorder with obsessions that focus on germs. Don’s therapist asks him to shake hands with everyone in his office and does not allow him to wash his hands afterward. His therapist is engaging in, which works by .

Which statement best describes the reason why the allies responded to the berlin blockade by airlifting supplies to the city? they did not have enough troops to attack the ussr. they controlled only the water routes to berlin. they controlled only one land route into west berlin. they did not want to use military force against the ussr.