The diagnostic criteria for insomnia, Which of the following is correct

A、Insomnia two times a week, sustained more than a month
B、Insomnia three times a week, sustained more than a month
C、Insomnia three times a week, sustained more than two months
D、Insomnia two times a week, sustained more than two months
E、Insomnia tLiree times a week, sustained more than three months