Answer:
B) nine months
Explanation:
The federal government grants patents to inventors so that they have exclusive rights to make, use, sell, or offer to sell an invention for a limited time: design patents last 14 years, while if you actually create a product the patent will last 20 years.
The whole idea behind patents is to give the inventor the time needed to reap the benefits  of their inventory in order to replenish costs and make a profit before other companies can make generic copies of the invention.