Answer: According to a 2009 Citizen Corps national survey, D. 29% of Americans have not prepared because they think that emergency responders will help them.
Step-by-step explanation: Citizen Corps is a program that provides training to the citizens of the United States in order for them to help in case of a natural disaster or a terrorist attack. A Citizen Corps national survey which was carried out in 2009 showed that 29% of Americans failed to prepare for believing that emergency responders such as the police and the firemen would help them. In that way, the correct answer is D.