Sat writing

why is the answer to this question "c" and what is wrong with my answer "b"?

When looking at research about instructional strategies, make sure the research is a. from peer-reviewed studies. b. approved by state and federal government organizations. c. online and easily accessible. d. about the same topic you're interested in.

What is an example of a college admissions test? -state test -cat -act -personality test

Tim earns $9.20 per hour when he works at the college library how much money does he earn by working at the library for 4.5 hours