A state park has two pools. The olympic size pool holds 8.12 x 10^5 gallons of water and the smaller pool holds 5.27 x 10^5 gallons of water. What is the combined capacity of the pools?
A) 1.339 x 10^4 gallons
B) 1.339 x 10^6 gallons
C) 13.39 x 10^10 gallons
D) 1.339 x 10^10 gallons