Many people with brain damage resulting in neuropsychological disorders have problems with __________ and self-regulation

__________ is/are a major cause of the dramatic rise in multiple births in recent decades.

Fill in the blank(s) with the appropriate word(s).

Why would a researcher want to ensure that every person in the underlying population of study has an equal chance of being included in the sample?

A. It helps eliminate a correlational relationship. B. It increases the chances of finding a causal relationship. C. It provides important epidemiological information, such as the prevalence and incidence of the disorder. D. It increases the researcher's ability to generalize findings to the larger group.