A large earthquake in rural China killed 250,000 people, while an earthquake of similar size in ...

A large earthquake in rural China killed 250,000 people, while an earthquake of similar size in California killed only 65. These comparative figures demonstrate that natural disasters can have greater or lesser effects on human life depending on ________
 
  A) social conditions that determine who has access to houses with appropriate safety features
  B) whether the government is communist or democratic
  C) how fast people can get away during a natural disaster
  D) nothing in particular; the differences in mortality rates were completely random