Over the last 6 months, you have noticed a decrease in existing referral traffic. Which of the following reasons is LEAST likely to cause the decrease in referral traffic?

Over the last 6 months, you have noticed a decrease in existing referral traffic. Which of the following reasons is LEAST likely to cause the decrease in referral traffic?

 

1. A) Decrease in blogging
2. B) Decrease in referral links
3. C) Referrer penalized by Google
4. D) Broken links to pages