Events D and E are independent, with with P(D) = 0.6 and P(D and E) = 0.18. Which of the following is true? 
选项为:A:P(E) = 0.12  B:P(E) = 0.4  C:P(D or E) = 0.28  D:P(D or E) = 0.72  E:P(D or E) = 0.9  请回答其中一个选项.