Journal Citation Reports Serve Which of the Following Purposes

Journal citation reports serve which of the following purposes?

A) They are like impact factors but take into account journals indexed in the Web of Science.
B) They are like impact factors, but instead focus on the author's rankings instead of the publication's rankings.
C) They are like impact factors, but take into account the number of authors on a publication.
D) They are like journal rankings, and also take into account how difficult the studies were to conduct.