Friction

In the diagram, object AA weighing 6 kg6 \text{ kg} is on a frictionless desk. Object BB weighing 3 kg3 \text{ kg} is sits atop A,A, moving together with it due to friction. Object CC weighing 1 kg1 \text{ kg} is connected with object BB by a pulley.

Which of the following statements is correct?

a)a) The magnitude of the force with which the string is pulling object CC is 99 N.
b)b) The direction of the friction force upon object BB is the same as the direction of motion of object A.A.
c)c) The magnitude of the friction force upon object BB is 66 N.

Gravitational acceleration is g=10 m/s2. g= 10 \text{ m/s}^2.

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