During the fall semester, 197 students registered for Chemistry. The morning class has 20 fewer ...

During the fall semester, 197 students registered for Chemistry. The morning class has 20 fewer students than the afternoon class. The evening class has 13 more students than the afternoon class. How many students registered for each class?
A) morning class = 68 students;
afternoon class = 48 students;
evening class = 81 students
B) morning class = 28 students;
afternoon class = 88 students;
evening class = 81 students
C) morning class = 48 students;
afternoon class = 68 students;
evening class = 81 students
D) morning class = 48 students;
afternoon class = 81 students;
evening class = 68 students