Twelve points are spaced evenly around a circle, lettered from A to L.

Dear Uma,

I'm happy to respond.

My friend, with all due respect, one of the most important qualities you can have in preparing for the GMAT, in B-school, and in your career in the business world, is initiative. Many people out there are simply good rule followers, but if you want to be manager, a leader, you need to demonstrate the ability to take advantage of resources and find out everything you can on your own. If, as a manager, you walk into your boss's office and ask for an explanation of something that you easily could have read yourself, your boss will not be impressed at all with you, and such things significantly matter when bosses consider raises and promotions. If you are comfortable with taking initiative and assuming responsibility for yourself, you will create positive impressions that will be rewarded time and time again.

For this problem, in my first post at the top of the problem, I included a link to a blog with the official explanation. I am going to ask you to go there, read the official explanation for this problem, and then ask me if there is anything that you don't understand. I will also suggest this blog:
Asking Excellent Questions

I will also say: I recommend refraining from using casual language on GMAT Club (e.g. the letter "u" for "you"). You are here to prepare for the GMAT, to prepare for the beginning of what will be your professional career. Anyone reading what you have written in this public forum could someday be in a position to evaluate you in your career. If you aspire to an excellent performance, then you should strive to bring excellence to every single aspect of how you go about these preparations. As a wise man said: "How you do anything is how you do everything."

Does all this make sense?
Mike