The average age of a certain number of students in a college club is 20 years. Later, 27 new students, whose average age is 22 years, joined the club. 12 students, whose average age is 19 years, left the club. As a result of this change, the average age of all the students increases by 2 years. What is the present number of students in the club?

A

15

B

42

C

33

D

25