Research by Russo and colleagues demonstrated that after women have abortions,they generally

A) immediately suffer from a condition known as postabortion trauma syndrome
B) suffer from postabortion trauma syndrome only after a period of time has elapsed
C) don't remember the experience
D) suffer no long-term ill effects to their well-being

To determine whether a new teaching method is effective for children who struggle with math,you design a study where you implement the method with a group of six-year olds,a group of eight-year olds,and a group of ten-year olds.What type of study is this

A)  naturalistic observation
B)  longitudinal study 
C)  experimental study
D)  cross-sectional study