Subject: mathqa
Question: a rainstorm increased the amount of water stored in state j reservoirs from 5 billion gallons to 7.5 billion gallons . if the storm increased the amount of water in the reservoirs to 55 percent of total capacity , approximately how many billion gallons of water were the reservoirs short of total capacity prior to the storm ?
Option: 
A: 4.4
B: 3.0
C: 1.4
D: 6.9
Answer: D