Over the weekend, the All Smiles Run had 16,478 participants for the Half Marathon. The All Smiles 10K had 6,924 participants, and the 5-Mile Walk had 3,067 participants.
How many more people participated in the Half Marathon than in the 10K race and the 5-Mile Walk combined?
a. 6,487
b. 6,587
c. 9,991
d. 12,621