This promotion is a fairly lengthy one. Once you launch the activity window, you'll need to watch a full Capital One trailer, and can then answer some quiz and survey about what you've seen or the Capital One brand in general. Don't worry - these "quiz" questions are incredibly easy, and if I had to make a guess, it likely wouldn't matter which way you answered; you'd still likely get the Farm Cash at the end.
After manually answering one fill-in-the-blank question, the activity will finally be complete, and you'll be the proud owner of 4 free Farm Cash. This is double the amount of Farm Cash we normally see released in such promotions, so at least it excuses a bit of the additional time it takes to complete this particular activity. As usual, you'll want to complete this promotion as soon as you see it pop-up underneath your game; there's no telling when it will expire, and you will have missed your chance.
Have you seen the Capital One promotion appear under your gameplay area in FarmVille? What will you do with your four free Farm Cash? Sound off in the comments.