Based on the information provided, the area that Gina needs to work on for better leadership is C. Gina needs to communicate more clearly and concisely.
The passage states that when Gina gives directions, Runa gets confused or is told she is doing it wrong. Gina's directions are also described as confusing, to the point where Runa is unsure of her assigned area of work. This suggests a communication issue between Gina and Runa. By improving her communication skills, specifically being clearer and more concise in her directions, Gina can become a better leader and provide effective guidance to Runa and others under her supervision.