A certain school implemented a reading program for its students, with the goal of getting each student to read 4 books per month year-round. If the school has c classes made up of s students in each class, how many books will the entire student body read in one year?
Choose the correct choice from the following:
A) 20 cs B) cs / 2 C) 48 cs D) ( 2 cs ) / 12 E) ( 24 c ) / s

Rationale: "ans : c solution : simple multiplication s students , c classes , 4 books / month = 48 books a year total number of books = 48 cs"
Answer: C