The first preference has to do with how you're ENERGIZED. Take a minute to look these two options over and give it some serious thought...

Column A
Column B
Tolerate noise and crowds. Avoid crowds and seek quiet.
Talk more than listen. Listen more than talk.
Communicate with enthusiasm. Keep enthusiasm to self.
Be distracted easily. Concentrate well.
Meet people readily and participate
   in many activities.
Proceed cautiously in meeting people
   & participate in selected activities.
Blurt things out w/o thinking. Think carefully before speaking.
Hates to do nothing. On the go. Time alone to recharges batteries.
Likes working or talking in
   groups
Would prefer to socialize in small
  groups or just do job "by myself."
Likes to be center of attention. Content being on the sidelines.
Now, think carefully. You might wanna say you're both. We all are. But the key is, "what are you more COMFORTABLE doing?" Go with your gut, and pick what you feel is the best answer. 
Choice A
Choice B