Which period of psychosexual development occurs when a child becomes preoccupied with the development of skills and other activities?

Which of the following are among the most common obsessive thoughts in people with obsessive-compulsive disorder?

A. Worry about humiliating oneself in public and fear of being bullied B. Fear of contamination and fear of harming others C. Being the victim of crime and having a panic attack in public D. Desire to get intoxicated on drugs and alcohol

When performing a research study, the major goal is to generate a sample that is ______

able to answer the scientific question representative of the population as large as possible easy to acquire