7. The coefficient of static friction between a certain cylinder and a horizontal floor is 0.40. If the rotational inertia of the cylinder about its symmetry axis is given by I = (1/2)MR², then the maximum acceleration the cylinder can have without sliding is: (A) 0.2 g (B) 0.4 g (C) 0.8 g (D) g (E) 1.2 g