Answer
$C\lt B\lt A$
Work Step by Step
We know that the greater the moment of inertia, the smaller will be the angular acceleration and vice versa. In the given scenario, case A has the smallest moment of inertia and thus has the greatest angular acceleration. Similarly, case C shows the largest moment of inertia and thus has the smallest angular acceleration. Thus, the increasing order of angular acceleration is: $C\lt B \lt A$.
