Numerous studies have been conducted on student test-taking behavior. the data from these studies have been compiled, and researchers have developed a set of concepts to explain this interrelated data and generate testable questions to verify these concepts. this set of concepts is called a(n) a. hypothesis b. experimental study c. abstract d. theory

Option D

Explanation: Theories are used for explaining and understanding a subject matter. For example; the theory of evolution, theory of Einstein on relativity and so on.

A theory is a linked idea use in explaining something - data. There are many advantages of theories(which I am just going to mention few of them. They;

(1). Makes us to identify a problem and plan a solution for it.

(2). They provide concept to name what is obtained or observed

because they equal life

explanation:

d, i believe because of it's activity level