Answer;
C. inward in either hemisphere.
The effect of friction on the net flow of air around cyclones is that it causes air to flow inward in either Hemisphere.
Step-by-step explanation;
Cyclones are regions of low pressure while anticyclones are regions of high pressure. The air flow in a cyclone is normally in a counterclockwise in the Northern Hemisphere and clockwise in the Southern Hemisphere. The flow of air in an anticyclone on the other hand is the opposite.
Friction is among the factors affecting the winds in cyclones and anticyclones, others being Coriolis effect, and pressure differences.
Friction causes a net flow of air inward around a cyclone and outward around an anticyclone.