Which of These Best Describes How Bond-Rating Agencies Affect the Interest

Which of these best describes how bond-rating agencies affect the interest rate that bonds must provide to attract borrowers?

A) Bond rating agencies in the past provided an initial evaluation of bonds; today, evaluations are daily and more reliable.
B) Bond rating agencies today provide significant warning for any changes in risk related to bond-issuing companies.
C) Bond rating agencies historically provide initial evaluation only of bonds; subsequent changes in performance must be noted by borrowers.
D) Bond rating agencies historically provide initial and ongoing evaluation of bonds to alert borrowers to their risk level.