Please, please tag the sources of the Questions you post in this forum.
If it is GMAT Prep, indicate that it is GMAT Prep. If it is from an MGMAT or Knewton
CAT, say so in the first line of the post. This is for your own good as it is for others. If we are to hold the GMAT Prep and these CATs as accurate indicators of your actual performance, it's under the assumption that you have not seen these questions before. If you already know the questions, then your score is unrealistically inflated and no one wants to go into the exam thinking they'll get a 790 and end up with a 590 (that's an exaggeration, but you know what I mean).
So PLEASE tag your source when you post and be as considerate of others as they are of you.