Two spools with equal radii and equal masses are wound onto opposite ends of a massless string,

Question

the center of which is then hung over a massless, frictionless pulley, as in the diagram to the right.
The spool on the left is a solid cylinder, while the one on the right is hollow. The two spools are
released from rest at equal heights and are allowed to fall/unwind. The string does not slip across
any of the surfaces it contacts. A little while later, which of the following is observed? [Hint: Force
diagrams and applications of Newton’s 2nd law for both linear and rotational motion may help.]
a. The solid spool is at the same height as the hollow spool and the pulley is rotating clockwise.
b. The solid spool is at the same height as the hollow spool and the pulley is rotating counterclockwise.
c. The solid spool is lower than the hollow spool and the pulley is rotating clockwise.
d. The solid spool is lower than the hollow spool and the pulley is rotating counterclockwise.
e. The solid spool is lower than the hollow spool and the pulley is stationary