In a study on test anxiety, a researcher is particularly interested in studying only first-year university students because the researcher wants the findings to generalize to only first-year students in large universities in the U. S. The researcher samples first-year students at the researcher's own west coast state university. The researcher has identified all first-year students at the researcher's institution, has determined his desired sample size, and has listed all the members of the population. What is the accessible population in the researcher's study?

a. First-year students at the researcher's university

b. Students at the researcher's university

c. West coast university students

d. First-year students at U.S. universities