(a) As the loop changes from irregular to a circular shape, its area increases. Hence, the magnetic flux linked with it increases. According to Lenz's law, the induced current should produce magnetic flux in the opposite direction of the original flux. This induced current should flow in the anti-clockwise direction. It means the direction of the current will be along adcba.

(b) As the circular loop is being deformed into a narrow straight wire, its area decreases. The magnetic field linked with it also decreases. By Lenz's law, the induced current should produce flux in the direction of the original flux. For this, the induced current should flow in the anti-clockwise direction. It means the direction of the current will be along a'd'c'b'.