The video says that researchers at the University of Michigan found that having close community ties can reduce heart attack risk for those over 50 by 22%. Which of the following describes a 22% decrease in risk?

A. Risk of a heart attack of those with "close community ties": 0.08. Risk of a heart attack of those without "close community ties": 0.10.
B. Risk of a heart attack of those with "close community ties": 0.10. Risk of a heart attack of those without "close community ties": 0.08.
C. Risk of a heart attack of those with "close community ties": 0.40. Risk of a heart attack of those without "close community ties": 0.18.
D. Risk of a heart attack of those with "close community ties": 0.18. Risk of a heart attack of those without "close community ties": 0.40.