The answer to this question is: Documents
Researchers will use these documents to gather data that will be analyzed in order to find a correlation between a certain occurrence with another.
For example, researchers could gather up the number of high school dropouts with criminal shootings to find out whether there is a correlation between the two.
Im pretty sure the correct answer is D
Answer:
The theory was proposing that children progress through different stages of cognitive development
Explanation:
Jean Piaget was a Swiss psychologist. He was a famous psychologist worked on child development. In his theory, he describes how children construct their mental model about the world. He never agreed with the concept that intelligence is fixed traits. He focused on the cognitive development of the children that occurs due to the combination of biological and environmental factors. He was the first psychologist who studied a systematic way of development of the children.
