Christina and frieda want to buy the same book. christina has 3/4 of the money needed to buy the book and ffrienda has half of the money needed to buy the book. if the book was 3$ chepaer, the together they would have exactly enough money to buy 2 copies of the book. what is the orginal price of the book?

A) 4$

B) 16$

C) 12$

D) 10$

E) 8$