Answer: c. competitor imitation
Explanation:
When a company makes a good product that people like and therefore brings in profit, other companies will copy that product if it is not protected by law so that they too can make profit as well.
This is what happened to the Crocs' clogs. Other companies imitated them and so Crocs lost their competitive advantage. This led to prices falling for such footwear as the supply increased. It is for this reason that companies try to get patents when they make a product.