"C" is typo as has been mentioned.
Reactive current now at 0.8 PF is 77A.
Reactive current at 0.9 will be 50A.
13 kVAR capacitor provides 27 A reactive.
Connecting the cap in parallel will bring the reactive current to 50 A and the PF to 0.9.
A reactive current is not necessarily the inductive - it may be capacitive as well. There is nothing said also whether the active power should stay the same.
The reactive (supposedly inductive) power is now 12.5 kVar (50/80 X 100 = 62.5 - 50 = 12.5) slightly less than the capacitive power (from...