A book is sitting on the table at rest. The forces acting on the book include _______, and these forces are _______.
 A. 
 gravity pushing up and friction pushing to the right; balanced
 B. 
 gravity pushing down and the table pushing up; unbalanced
 C. 
 gravity pushing down and the table pushing up; balanced
 D. 
 gravity pushing up and friction pushing to the right; unbalanced