KANSAS CITY, Mo. (AP) KANSAS CITY, Mo. (AP) - The Kansas City Chiefs are exercising their fifth-year option on Super Bowl MVP Patrick Mahomes (mah-HOHMZ'), according to a person familiar with their decision. But the person tells The Associated Press that both sides remain optimistic that they will agree on a long-term contract before the start of the season. Teams are allowed to use a fifth-year option on players selected in the first round of the NFL draft. If the Chiefs are unable to sign Mahomes to a long-term deal, he would be due a base salary of $25 million for the 2021 season.